[8.x] [Monitoring] Make monitoring collection API public again (elast…

…ic#205190) (elastic#205200)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Monitoring] Make monitoring collection API public again
(elastic#205190)](elastic#205190)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Valentin
Crettaz","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-12-27T12:16:01Z","message":"[Monitoring]
Make monitoring collection API public again (elastic#205190)\n\nRelated to
https://github.com/elastic/kibana/pull/186882\r\n\r\n##
Summary\r\n\r\nhttps://github.com/elastic/issues/186781 required
all teams to\r\nmake sure that all Kibana APIs in their respective
plugins were using\r\nthe appropriate access `internal` or
`public`.\r\n\r\nPR elastic#186882
flagged the\r\n`/api/monitoring_collection/{type}` API endpoint as
`internal`. The\r\neffect of that change was the [appearance of
deprecation\r\nlogging](https://github.com/elastic/kibana/pull/186882#issuecomment-2431021055)\r\nin
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Make monitoring collection API public
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Make monitoring collection API public again (elastic#205190)\n\nRelated to
https://github.com/elastic/kibana/pull/186882\r\n\r\n##
Summary\r\n\r\nhttps://github.com/elastic/issues/186781 required
all teams to\r\nmake sure that all Kibana APIs in their respective
plugins were using\r\nthe appropriate access `internal` or
`public`.\r\n\r\nPR elastic#186882
flagged the\r\n`/api/monitoring_collection/{type}` API endpoint as
`internal`. The\r\neffect of that change was the [appearance of
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Make monitoring collection API public again (elastic#205190)\n\nRelated to
https://github.com/elastic/kibana/pull/186882\r\n\r\n##
Summary\r\n\r\nhttps://github.com/elastic/issues/186781 required
all teams to\r\nmake sure that all Kibana APIs in their respective
plugins were using\r\nthe appropriate access `internal` or
`public`.\r\n\r\nPR elastic#186882
flagged the\r\n`/api/monitoring_collection/{type}` API endpoint as
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BACKPORT-->

Co-authored-by: Valentin Crettaz <[email protected]>

x-pack/platform/plugins/private/monitoring_collection/server/routes/api/v1/dynamic_route/get_metrics_by_type.ts

@@ -44,7 +44,7 @@ export function registerDynamicRoute({
         },
       },
       options: {
-        access: 'internal',
+        access: 'public',
         authRequired: true,
         tags: ['api'], // ensures that unauthenticated calls receive a 401 rather than a 302 redirect to login page
       },