[ControllerManager] Fix all warnings from the latets features. (backport #1174)

[mergify]

This is an automatic backport of pull request #1174 done by Mergify.
Cherry-pick of 7d79464 has failed:

On branch mergify/bp/humble/pr-1174
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit 7d79464.
  (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:   controller_manager/src/controller_manager.cpp
	modified:   controller_manager/test/test_controller_manager_srvs.cpp

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   controller_manager/test/test_controller_failed_init/test_controller_failed_init.cpp
	both modified:   controller_manager/test/test_controller_manager.cpp

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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[mergify]

This pull request is in conflict. Could you fix it @bmagyar @destogl @christophfroehlich?