[CI] Clean all yaml in the pipelines of warnings and errors and add a workflow to validate the yaml used.

[mandel-macaque]

Description of Change

This PR is better reviewed file by files since it is a large one. The PR does the following:

1. Creates a workflow that will execute yamllint on the devops yaml files. The workflow will add a human readable and GitHub formatted comment with all the warnings and errors found in the PR, that way no new errors will be introduced.
2. Cleans all the yamllint warnings and errors of the pipelines present in the source.

This will help us keep the pipeline code clean. For anyone working on the pipelines, you can install locally yamllint and run it or add one of its editor plugins: https://yamllint.readthedocs.io/en/stable/text_editors.html

[mandel-macaque]

@rmarinho I'm using an action for the comment which might have not been approved, should we move to a curl? Although its a lot more work

[rmarinho]

I think we have permissions to use other actions

[mandel-macaque]

I think we have permissions to use other actions

@rmarinho If you click on actions you'll see that it did not run. I suppose it needs an update in the settings.

[jsuarezruiz]

@mandel-macaque Thanks for the effort and sorry for the delay. Could you rebase it?