[Request][Serverless][8.16] GA-ing alert suppression for IM rule, Threshold rule, ML rule, ES|QL rule and New Terms rule

[nastasha-solomon]

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.

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[mergify]

This pull request is now in conflicts. Could you fix it @nastasha-solomon? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b issue-5897-alert-suppress-ga upstream/issue-5897-alert-suppress-ga
git merge upstream/main
git push upstream issue-5897-alert-suppress-ga

[jmikell821]

Changes LGTM!