shelve: delete shelve statefile on any exception during abort
When a user's repository is in an unfinished unshelve state and they choose to abort, at a minimum, the repo should be out of that state. We've found situations where the user could not leave the state unless manually deleting the state file. This fix ensures that no matter what exception may be raised during the abort, the shelved state file will be deleted, the user will be out of the unshelve state and they can get their repository into a workable condition.
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