Add kilted info and update workflows (backport #809)

[mergify]

and some cleanup + linting

---

This is an automatic backport of pull request #809 done by Mergify.

[mergify]

Cherry-pick of 5677534 has failed:

On branch mergify/bp/humble/pr-809
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit 5677534.
  (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:   .github/workflows/humble-semi-binary-build.yml
	modified:   .github/workflows/rolling-binary-build.yml
	modified:   .github/workflows/rolling-docker-build.yaml
	modified:   .github/workflows/rolling-pre-commit.yml
	modified:   .github/workflows/rolling-semi-binary-build.yml
	modified:   README.md
	new file:   ros2_control_demos-not-released.kilted.repos
	modified:   ros2_control_demos.humble.repos
	new file:   ros2_control_demos.kilted.repos

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   ros2_control_demos.jazzy.repos
	both modified:   ros2_control_demos.rolling.repos

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally