Modularize VCS Support, introduce Git and JJ backends #4545
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Instead of hardcoding the assumption that Git will be used as a Repo this PR introduces a generic repo.py module which then routes calls like
commitorundoto the currently active repo support class.For now JJ support has to be manually enabled using
--vcs jjflag. If this is merged we can later improve the automatic detection of repo types to also include JJ.The change modularizes VCS code into a central module and thereby prepares the ground for also other VCS support, such as #446