kata-deploy: improving the runtimeclasses checker and documentation

[wainersm]

While working on PR #9807 it was a little of a pain to pass the static checker for the runtimeClasses that kata-deploy deploys on the cluster. I realized that it wasn't the first time I had the same difficult to pass CI, likely because I wasn't able to run the checker locally. So here I am sending some improvements to allow devs to run the checker locally before submitting a PR. In particular, the LC_ALL=C trick was hurting my tentative to get the checker passing.

Taking that opportunity to also document how to add a new runtimeClass to kata-deploy.

[wainersm]

Tentatively making spell and commit checkers happy.

[wainersm]

Updated to address @beraldoleal 's suggestion; now the job's name is on first line.

[wainersm]

Updated this PR to address @ldoktor 's comments.

[wainersm]

Updated this:

• rebased to main
• using select instead of indexes to get the shim list

[github-actions[bot]]

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