[8.14] Endpoint system requirements (backport #5271)

[mergify]

Resolves #4636. Adds Endpoint system requirements to ESS and serverless docs.

Previews:

• ESS: Elastic Endpoint requirements
• Serverless: Install Elastic Endpoint manually

---

This is an automatic backport of pull request #5271 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 272fc61 has failed:

On branch mergify/bp/8.14/pr-5271
Your branch is up to date with 'origin/8.14'.

You are currently cherry-picking commit 272fc613.
  (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/elastic-endpoint-reqs.asciidoc

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

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