[8.x] Permissions for alert suppression in machine learning rules (backport #5819)

[mergify]

Resolves #5492.

Previews

• ESS:

  • Machine learning job and rule requirements — Added index requirements.
  • Alert suppression — Updated requirements callout with link to ML requirements.

• Serverless: Click the link in the comment below, then in the Security card click View serverless docs. Navigate to the pages listed above.

  ---

  This is an automatic backport of pull request Permissions for alert suppression in machine learning rules #5819 done by Mergify.

[mergify]

Cherry-pick of 632deff has failed:

On branch mergify/bp/8.x/pr-5819
Your branch is up to date with 'origin/8.x'.

You are currently cherry-picking commit 632deff5.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   docs/advanced-entity-analytics/ml-req.asciidoc
	modified:   docs/detections/alert-suppression.asciidoc

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   docs/serverless/advanced-entity-analytics/ml-requirements.mdx
	deleted by us:   docs/serverless/alerts/alert-suppression.mdx

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[github-actions]

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