[CI] Update coverage workflows and some cleanup (backport #819)

[mergify]

This is an automatic backport of pull request #819 done by Mergify.
Cherry-pick of 232154d has failed:

On branch mergify/bp/humble/pr-819
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit 232154d.
  (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:
	new file:   .github/workflows/ci-coverage-build-humble.yml
	new file:   .github/workflows/ci-coverage-build-iron.yml
	modified:   .github/workflows/ci-coverage-build.yml
	modified:   .github/workflows/reusable-ros-tooling-source-build.yml
	modified:   ros2_controllers.rolling.repos

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   ros2_controllers.iron.repos

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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[christophfroehlich]

closed in favor of #830