[8.13] Automated endpoint response actions on rules (kill/suspend process) (backport #4890)

[mergify]

Contributes to #4874.

Previews

• Automated response actions – New page with overall instructions on adding automated response actions to rules.
• Create a detection rule | Set up response actions (optional) — Revise section to point to new page above, and a bit o' reformatting.

Related docs PR

#4885 makes some organizational changes to rearrange the response action pages into a top-level section. This will affect the current PR since it also creates a new page in this section. Expect some light conflicts when either of these is merged, but should be easily resolvable.

Serverless docs

No serverless docs PR open yet. I'll wait until the content is finalized in this classic/ESS PR, then open a serverless docs PR with the same content changes.

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This is an automatic backport of pull request #4890 done by Mergify.

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