contributing: move GitHub workflow docs into separate file #3875
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I moved the Github workflow into a separate file to keep the CONTRIBUTING.md file short and not overwhelming. I removed the link to trac wiki, if there are any pieces relevant for new contributors, they should be moved here. I tried to check that, but this needs review. In Updating your PR from main I changed it from rebase to merge to make things less error prone. The rest of the contributing file needs updates as well, but that's out of scope of this PR.