[8.9] Handle queue.* config for libbeat outputs (backport #11534)

[mergify]

This is an automatic backport of pull request #11534 done by Mergify.
Cherry-pick of 3771a5f has failed:

On branch mergify/bp/8.9/pr-11534
Your branch is up to date with 'origin/8.9'.

You are currently cherry-picking commit 3771a5fe7.
  (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:   internal/beater/beater.go
	modified:   systemtest/apmservertest/config.go
	new file:   systemtest/logstash_test.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   changelogs/8.10.asciidoc
	both modified:   systemtest/go.mod
	both modified:   systemtest/go.sum

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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