[8.17] [Monitoring] Make monitoring collection API public again (#205190) (#205199)

# Backport

This will backport the following commits from `main` to `8.17`:
- [[Monitoring] Make monitoring collection API public again
(#205190)](https://github.com/elastic/kibana/pull/205190)

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

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

<!--BACKPORT [{"author":{"name":"Valentin
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Make monitoring collection API public again (#205190)\n\nRelated to
https://github.com/elastic/kibana/pull/186882\r\n\r\n##
Summary\r\n\r\nhttps://github.com/elastic/kibana/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 https://github.com/elastic/kibana/pull/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 (#205190)\n\nRelated to
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Summary\r\n\r\nhttps://github.com/elastic/kibana/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 https://github.com/elastic/kibana/pull/186882
flagged the\r\n`/api/monitoring_collection/{type}` API endpoint as
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Make monitoring collection API public again (#205190)\n\nRelated to
https://github.com/elastic/kibana/pull/186882\r\n\r\n##
Summary\r\n\r\nhttps://github.com/elastic/kibana/issues/186781 required
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plugins were using\r\nthe appropriate access `internal` or
`public`.\r\n\r\nPR https://github.com/elastic/kibana/pull/186882
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BACKPORT-->

Co-authored-by: Valentin Crettaz <valentin.crettaz@elastic.co>

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

@@ -37,7 +37,7 @@ export function registerDynamicRoute({
     {
       path: `${MONITORING_COLLECTION_BASE_PATH}/{type}`,
       options: {
-        access: 'internal',
+        access: 'public',
         authRequired: true,
         tags: ['api'], // ensures that unauthenticated calls receive a 401 rather than a 302 redirect to login page
       },