localrepo: use dirstate restorebackup instead of copying dirstate manually
This is one step towards having dirstate manage its own storage. It will be useful for the implementation of sqldirstate [1]. I'm deleting two of the dirstate.invalidate() calls in localrepo because restorebackup method does that for us. [1] https://www.mercurial-scm.org/wiki/SQLDirstatePlan
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