controller_manager_srvs tests: Add text to assertions (backport #1023)

[mergify]

This is an automatic backport of pull request #1023 done by Mergify.
Cherry-pick of 775dd6a has failed:

On branch mergify/bp/humble/pr-1023
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit 775dd6a.
  (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:   controller_manager/test/test_hardware_management_srvs.cpp

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/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[arne48]

I am not familiar with mergify but for some reason the cherrypick failed and it added the git conflict markers into the file.
line. 94,100,112
Maybe fix it and try again?

[bmagyar]

I think I fixed the conflict