[Inspector] EUI Visual Refresh Integration (elastic#204436)

## Summary

Related to elastic#203132.
Closes [elastic#204595](elastic#204595).

This replaces all references to euiThemeVars in favor of the useEuiTheme
hook in the inspector plugin.


### Checklist

Check the PR satisfies following conditions. 

Reviewers should verify this PR satisfies this list as well.

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [ ] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [ ] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

### Identify risks

Does this PR introduce any risks? For example, consider risks like hard
to test bugs, performance regression, potential of data loss.

Describe the risk, its severity, and mitigation for each identified
risk. Invite stakeholders and evaluate how to proceed before merging.

- [ ] [See some risk
examples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx)
- [ ] ...

---------

Co-authored-by: kibanamachine <[email protected]>

src/platform/plugins/shared/inspector/public/views/requests/components/details/clusters_view/clusters_health/cluster_health.tsx

@@ -10,7 +10,7 @@
 import React from 'react';
 import { i18n } from '@kbn/i18n';
 import { EuiHealth, EuiText, EuiTextProps } from '@elastic/eui';
-import { HEALTH_HEX_CODES } from './gradient';
+import { useHealthHexCodes } from './gradient';
 
 interface Props {
   count?: number;
@@ -24,29 +24,30 @@ const defaultTextProps: EuiTextProps = {
 };
 
 export function ClusterHealth({ count, status, textProps = defaultTextProps }: Props) {
+  const healthHexCodes = useHealthHexCodes();
   if (typeof count === 'number' && count === 0) {
     return null;
   }
 
   let color = 'subdued';
   let statusLabel = status;
   if (status === 'successful') {
-    color = HEALTH_HEX_CODES.successful;
+    color = healthHexCodes.successful;
     statusLabel = i18n.translate('inspector.requests.clusters.successfulLabel', {
       defaultMessage: 'successful',
     });
   } else if (status === 'partial') {
-    color = HEALTH_HEX_CODES.partial;
+    color = healthHexCodes.partial;
     statusLabel = i18n.translate('inspector.requests.clusters.partialLabel', {
       defaultMessage: 'partial',
     });
   } else if (status === 'skipped') {
-    color = HEALTH_HEX_CODES.skipped;
+    color = healthHexCodes.skipped;
     statusLabel = i18n.translate('inspector.requests.clusters.skippedLabel', {
       defaultMessage: 'skipped',
     });
   } else if (status === 'failed') {
-    color = HEALTH_HEX_CODES.failed;
+    color = healthHexCodes.failed;
     statusLabel = i18n.translate('inspector.requests.clusters.failedLabel', {
       defaultMessage: 'failed',
     });

src/platform/plugins/shared/inspector/public/views/requests/components/details/clusters_view/clusters_health/clusters_health.tsx

@@ -10,11 +10,10 @@
 import React from 'react';
 import { estypes } from '@elastic/elasticsearch';
 import { css } from '@emotion/react';
-import { euiThemeVars } from '@kbn/ui-theme';
 import { i18n } from '@kbn/i18n';
-import { EuiFlexGroup, EuiFlexItem, EuiText } from '@elastic/eui';
+import { EuiFlexGroup, EuiFlexItem, EuiText, useEuiTheme } from '@elastic/eui';
 import { ClusterHealth } from './cluster_health';
-import { getHeathBarLinearGradient } from './gradient';
+import { useHeathBarLinearGradient } from './gradient';
 
 interface Props {
   clusters: Record<string, estypes.ClusterDetails>;
@@ -25,6 +24,8 @@ export function ClustersHealth({ clusters }: Props) {
   let partial = 0;
   let skipped = 0;
   let failed = 0;
+  const { euiTheme } = useEuiTheme();
+
   Object.values(clusters).forEach((clusterDetails) => {
     if (clusterDetails.status === 'successful') {
       successful++;
@@ -76,11 +77,11 @@ export function ClustersHealth({ clusters }: Props) {
 
       <div
         css={css`
-          background: ${getHeathBarLinearGradient(successful, partial, skipped, failed)};
-          border-radius: ${euiThemeVars.euiBorderRadiusSmall};
-          height: ${euiThemeVars.euiSizeS};
-          margin-top: ${euiThemeVars.euiSizeXS};
-          margin-bottom: ${euiThemeVars.euiSizeS};
+          background: ${useHeathBarLinearGradient(successful, partial, skipped, failed)};
+          border-radius: ${euiTheme.border.radius.small};
+          height: ${euiTheme.size.s};
+          margin-top: ${euiTheme.size.xs};
+          margin-bottom: ${euiTheme.size.s};
         `}
       />
     </>

src/platform/plugins/shared/inspector/public/views/requests/components/details/clusters_view/clusters_health/gradient.test.ts

@@ -7,18 +7,32 @@
  * License v3.0 only", or the "Server Side Public License, v 1".
  */
 
-import { getHeathBarLinearGradient, HEALTH_HEX_CODES } from './gradient';
+import { useHeathBarLinearGradient, useHealthHexCodes } from './gradient';
+
+jest.mock('@elastic/eui', () => ({
+  useEuiTheme: () => ({
+    euiTheme: {
+      colors: {
+        backgroundFilledSuccess: 'green',
+        backgroundLightWarning: 'yellow',
+        backgroundFilledDanger: 'red',
+      },
+    },
+  }),
+}));
+
+describe('useHeathBarLinearGradient', () => {
+  const healthHexCodes = useHealthHexCodes();
 
-describe('getHeathBarLinearGradient', () => {
   test('should return linear-gradient with percentages for each status', () => {
-    expect(getHeathBarLinearGradient(5, 1, 1, 2)).toBe(
-      `linear-gradient(to right, ${HEALTH_HEX_CODES.successful} 0% 56%, ${HEALTH_HEX_CODES.partial} 56% 67%, ${HEALTH_HEX_CODES.skipped} 67% 78%, ${HEALTH_HEX_CODES.failed} 78% 100%)`
+    expect(useHeathBarLinearGradient(5, 1, 1, 2)).toBe(
+      `linear-gradient(to right, ${healthHexCodes.successful} 0% 56%, ${healthHexCodes.partial} 56% 67%, ${healthHexCodes.skipped} 67% 78%, ${healthHexCodes.failed} 78% 100%)`
     );
   });
 
   test('should return linear-gradient with percentages for each status with count above zero', () => {
-    expect(getHeathBarLinearGradient(5, 0, 0, 2)).toBe(
-      `linear-gradient(to right, ${HEALTH_HEX_CODES.successful} 0% 71%, ${HEALTH_HEX_CODES.failed} 71% 100%)`
+    expect(useHeathBarLinearGradient(5, 0, 0, 2)).toBe(
+      `linear-gradient(to right, ${healthHexCodes.successful} 0% 71%, ${healthHexCodes.failed} 71% 100%)`
     );
   });
 });

src/platform/plugins/shared/inspector/public/views/requests/components/details/clusters_view/clusters_health/gradient.ts

@@ -7,21 +7,26 @@
  * License v3.0 only", or the "Server Side Public License, v 1".
  */
 
-import { euiThemeVars } from '@kbn/ui-theme';
-
-export const HEALTH_HEX_CODES = {
-  successful: euiThemeVars.euiColorSuccess,
-  partial: euiThemeVars.euiColorWarning,
-  skipped: '#DA8B45',
-  failed: euiThemeVars.euiColorDanger,
-};
+import { useEuiTheme } from '@elastic/eui';
+
+export function useHealthHexCodes() {
+  const { euiTheme } = useEuiTheme();
+  return {
+    successful: euiTheme.colors.backgroundFilledSuccess,
+    partial: euiTheme.colors.backgroundLightWarning,
+    skipped: euiTheme.colors.backgroundFilledWarning,
+    failed: euiTheme.colors.backgroundFilledDanger,
+  };
+}
 
-export function getHeathBarLinearGradient(
+export function useHeathBarLinearGradient(
   successful: number,
   partial: number,
   skipped: number,
   failed: number
 ) {
+  const healthHexCodes = useHealthHexCodes();
+
   const total = successful + partial + skipped + failed;
   const stops: string[] = [];
   let startPercent: number = 0;
@@ -37,10 +42,10 @@ export function getHeathBarLinearGradient(
     startPercent = endPercent;
   }
 
-  addStop(successful, HEALTH_HEX_CODES.successful);
-  addStop(partial, HEALTH_HEX_CODES.partial);
-  addStop(skipped, HEALTH_HEX_CODES.skipped);
-  addStop(failed, HEALTH_HEX_CODES.failed);
+  addStop(successful, healthHexCodes.successful);
+  addStop(partial, healthHexCodes.partial);
+  addStop(skipped, healthHexCodes.skipped);
+  addStop(failed, healthHexCodes.failed);
 
   const printedStops = stops
     .map((stop, index) => {

src/platform/plugins/shared/inspector/tsconfig.json

@@ -15,7 +15,6 @@
     "@kbn/core-ui-settings-browser-mocks",
     "@kbn/core-ui-settings-browser",
     "@kbn/std",
-    "@kbn/ui-theme",
     "@kbn/code-editor",
     "@kbn/core-lifecycle-browser",
     "@kbn/react-kibana-mount"