[9.3](backport #6614) [main](backport #6603) Add Fleet Server 9.2.7 release notes

[mergify]

Adds Fleet Server 9.2.7 release notes.

Checklist

• @pierrehilbert review this PR to make sure the correct items are included
• @elastic/ingest-docs review the language
• @pierrehilbert merge this PR and forwardports on the day before the release release day
  • Note: In this repo, we publish from the main branch. The changes in this PR will not be available on the docs site until they are added to the main branch.

Update: All release notes should be merged the day before the release per the docs release issue

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This is an automatic backport of pull request #6603 done by Mergify.

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This is an automatic backport of pull request #6614 done by Mergify.

[mergify]

Cherry-pick of a16d1af has failed:

On branch mergify/bp/9.3/pr-6614
Your branch is up to date with 'origin/9.3'.

You are currently cherry-picking commit a16d1af.
  (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:
	new file:   changelog/9.2.7.yaml
	new file:   docs/release-notes/_snippets/9.2.7/breaking-changes.md
	new file:   docs/release-notes/_snippets/9.2.7/deprecations.md
	new file:   docs/release-notes/_snippets/9.2.7/index.md

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/release-notes/_snippets/breaking-changes/9.2.md
	both modified:   docs/release-notes/_snippets/deprecations/9.2.md
	both modified:   docs/release-notes/_snippets/index/9.2.md

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]

✅ Vale Linting Results

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