[8.16] [Serverless bug bash] Removes outdated content (backport #6188)

[mergify]

Serverless bug bash

Resolves #6056 by removing outdated content on the Configure an integration policy for Elastic Defend page that references versions no longer supported by Elastic Defend.

The same fix has been applied to ESS docs.

Previews

Serverless: Configure an integration policy for Elastic Defend | Register Elastic Security as antivirus (optional)

ESS: Configure an integration policy for Elastic Defend | Register Elastic Security as antivirus (optional)

---

This is an automatic backport of pull request #6188 done by Mergify.

[mergify]

Cherry-pick of 6247f6c has failed:

On branch mergify/bp/8.16/pr-6188
Your branch is up to date with 'origin/8.16'.

You are currently cherry-picking commit 6247f6cb.
  (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/getting-started/configure-integration-policy.asciidoc

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   docs/serverless/edr-install-config/configure-endpoint-integration-policy.asciidoc

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]

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[natasha-moore-elastic]

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