mon: run ceph commands to mon with timeout (backport #8939)

[mergify]

This is an automatic backport of pull request #8939 done by Mergify.
Cherry-pick of 8da68bf has failed:

On branch mergify/bp/release-1.6/pr-8939
Your branch is up to date with 'origin/release-1.6'.

You are currently cherry-picking commit 8da68bfb7.
  (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:   pkg/operator/ceph/cluster/mgr/mgr_test.go
	modified:   pkg/operator/ceph/config/monstore.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   pkg/operator/ceph/cluster/cephstatus_test.go
	both modified:   pkg/operator/ceph/config/monstore_test.go
	both modified:   pkg/operator/ceph/pool/controller_test.go

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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[leseb]

This does not seem to be a critical fix for 1.6, so closing.