[8.x] [Request][Serverless][8.16] GA-ing alert suppression for IM rule, Threshold rule, ML rule, ES|QL rule and New Terms rule (backport #5926)

[mergify]

Fixes #5897

ESS

• Suppress detection alerts: The note at the start of the page now shows that alert suppression is only in tech preview for the event correlation (EQL) rule type.
• Create rule: Removed the tech preview label at the start of the step that describes how to configure alert suppression for indicator match, threshold, ML, ES|QL, and new term rule types.
• Create rule API | Optional alert suppression fields: The note at the start of the page now shows that alert suppression is only in tech preview for the event correlation (EQL) rule type.
• Update rule API | Optional alert suppression fields: Ditto

Serverless

• Suppress detection alerts: The note at the start of the page now shows that alert suppression is only in tech preview for the event correlation (EQL) rule type.
• Create rule: Removed the tech preview label at the start of the step that describes how to configure alert suppression for indicator match, threshold, ML, ES|QL, and new term rule types.

  ---

  This is an automatic backport of pull request [Request][Serverless][8.16] GA-ing alert suppression for IM rule, Threshold rule, ML rule, ES|QL rule and New Terms rule #5926 done by Mergify.

[mergify]

Cherry-pick of d154348 has failed:

On branch mergify/bp/8.x/pr-5926
Your branch is up to date with 'origin/8.x'.

You are currently cherry-picking commit d1543482.
  (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/detections/alert-suppression.asciidoc
	modified:   docs/detections/api/rules/rules-api-create.asciidoc
	modified:   docs/detections/api/rules/rules-api-update.asciidoc
	modified:   docs/detections/rules-ui-create.asciidoc

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   docs/serverless/alerts/alert-suppression.mdx
	deleted by us:   docs/serverless/rules/rules-ui-create.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]

A documentation preview will be available soon.

• 🔨 Buildkite builds
• 📚 HTML diff
• 📙 Preview page

Request a new doc build by commenting

• Rebuild this PR: run docs-build
• Rebuild this PR and all Elastic docs: run docs-build rebuild

_{run docs-build is much faster than run docs-build rebuild. A rebuild should only be needed in rare situations.}

_{If your PR continues to fail for an unknown reason, the doc build pipeline may be broken. Elastic employees can check the pipeline status here.}