[8.8](backport #3601) Update and rename doc-preview.yml to docs-preview.yml

[mergify]

Move away from our own custom implementation of commenting on PRs to the shared implementation.

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This is an automatic backport of pull request #3601 done by Mergify.

[mergify]

Cherry-pick of f3daba8 has failed:

On branch mergify/bp/8.8/pr-3601
Your branch is up to date with 'origin/8.8'.

You are currently cherry-picking commit f3daba86.
  (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:   .github/workflows/docs-preview.yml

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by them: .github/workflows/doc-preview.yml

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