3.13.x, by @Ayanda-D: stop QQ replicas when a QQ is forced to shrink to a single replica (backport #12475)

[mergify]

This is #12427 by @Ayanda-D submitted against v4.0.x.

Shrinking operations did not stop QQ replicas. This was easy to miss because QQs are usually shrunk before a node is removed from the cluster.

However, there is a scenario where this is not the case. If some nodes (replicas) need to be replaced, in particular when a majority of nodes cannot be recovered for any reasons, the recovery process will involve shrinking a QQ to just one member so that it has an online quorum (of 1 node out of 1) before new replicas can be added.

For this to succeed, the older replicas must be stopped and deleted from the (QQ) cluster.

---

This is an automatic backport of pull request #12475 done by Mergify.

[mergify]

Cherry-pick of 2e37ac6 has failed:

On branch mergify/bp/v3.13.x/pr-12475
Your branch is ahead of 'origin/v3.13.x' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 2e37ac607d.
  (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)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   deps/rabbit/test/quorum_queue_SUITE.erl

no changes added to commit (use "git add" and/or "git commit -a")

Cherry-pick of 6c55cb1 has failed:

On branch mergify/bp/v3.13.x/pr-12475
Your branch is ahead of 'origin/v3.13.x' by 3 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 6c55cb1fdc.
  (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)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   deps/rabbit/test/quorum_queue_SUITE.erl

no changes added to commit (use "git add" and/or "git commit -a")

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