commit: factor out post-commit cleanup into workingctx This pulls some of the logic for the cleanup that needs to happen after a commit has been made otu of localrepo.commit and into workingctx. This is part of a larger refactoring effort that will eventually allow us to perform some types of merges in-memory.

localrepo: use workingctx for validation in commit This changes localrepo.commit to use the workingctx it creates form the munged output of localrepo.status while running some precommit validation. Specifically, it uses functions that were already present on the workingctx. I believe this is a net readabilty improvement, and that this makes these lines consistent with the refactoring in a subsequent patch that pulls some of the validation logic into workingctx so that it can be reused elsewhere.

localrepo: create context used for actual commit earlier localrepo.commit creates a workingctx, calls self.status, does some munging on the changes status returns, does some validation on those changes, and then creates a new workingctx from the changes. This moves the creation of the new workginctx ahead of some validation, with the intention of refactoring some of that validation logic into the workingctx, so that it can be reused elsewhere.

merge with crew-stable