[SLOs] Added $state into filters schema !! (#202887)

## Summary

fixes #202999

Added $state  into filters schema !!

(cherry picked from commit 51e63ee)

x-pack/packages/kbn-slo-schema/src/schema/indicators.ts

@@ -11,26 +11,31 @@ import { allOrAnyString } from './common';
 const kqlQuerySchema = t.string;
 
 const filtersSchema = t.array(
-  t.type({
-    meta: t.partial({
-      alias: t.union([t.string, t.null]),
-      disabled: t.boolean,
-      negate: t.boolean,
-      // controlledBy is there to identify who owns the filter
-      controlledBy: t.string,
-      // allows grouping of filters
-      group: t.string,
-      // index and type are optional only because when you create a new filter, there are no defaults
-      index: t.string,
-      isMultiIndex: t.boolean,
-      type: t.string,
-      key: t.string,
-      field: t.string,
-      params: t.any,
-      value: t.string,
+  t.intersection([
+    t.type({
+      meta: t.partial({
+        alias: t.union([t.string, t.null]),
+        disabled: t.boolean,
+        negate: t.boolean,
+        // controlledBy is there to identify who owns the filter
+        controlledBy: t.string,
+        // allows grouping of filters
+        group: t.string,
+        // index and type are optional only because when you create a new filter, there are no defaults
+        index: t.string,
+        isMultiIndex: t.boolean,
+        type: t.string,
+        key: t.string,
+        field: t.string,
+        params: t.any,
+        value: t.string,
+      }),
+      query: t.record(t.string, t.any),
+    }),
+    t.partial({
+      $state: t.any,
     }),
-    query: t.record(t.string, t.any),
-  })
+  ])
 );
 
 const kqlWithFiltersSchema = t.type({