git_handler: stop exporting commits before performing a fetch
While this has been done since the beginning of time, there's no apparent justification for it. If an imported commit works out to the same hash as an existing one, it simply won't be added to the revlog. The tests all continue to pass. There's already test coverage for reimporting commits in test-pull-after-strip.t. Also, gimport has worked this way all this while.
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