Mark test deps as such (backport #7463) (backport #7471) (backport #7472)

[mergify]

This is an automatic backport of pull request #7472 done by Mergify.
Cherry-pick of 67e6ef1 has failed:

On branch mergify/bp/v3.10.x/pr-7472
Your branch is up to date with 'origin/v3.10.x'.

You are currently cherry-picking commit 67e6ef1a2f.
  (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:   BAZEL.md
	modified:   BUILD.bazel
	modified:   WORKSPACE
	modified:   bazel/BUILD.ct_helper
	modified:   bazel/BUILD.emqtt
	modified:   bazel/BUILD.getopt
	modified:   bazel/BUILD.meck
	modified:   bazel/BUILD.observer_cli
	modified:   bazel/BUILD.prometheus
	modified:   bazel/BUILD.proper
	modified:   deps/rabbitmq_ct_client_helpers/BUILD.bazel
	modified:   deps/rabbitmq_ct_helpers/BUILD.bazel
	modified:   deps/rabbitmq_trust_store/BUILD.bazel
	modified:   moduleindex.yaml
	modified:   tools/BUILD.bazel

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   MODULE.bazel

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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