Backport fix to make Import tablet idempotent #4676
Merged
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This backports the fix from #4646 to make MoveExportedFiles fate step idempotent.
This closes #4655
Note: ComprehensiveIT does not exist in 2.1 so those changes that were part of #4646 were not backported. I think there are other ITs that exist for table import though, so I wasn't sure if we wanted to test this in some other way or bring back that test and the flaky comprehensive test too. The test does exist in main so we could maybe add it there.