Do not attempt to complete pre- or post-process if jobs are cancelled in the middle of either stage #365
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Mostly fixes #364. Ideally we would also interrupt any running transfers since those could be exceptionally long running and wasteful, but doing so requires interrupting a thread running a non-looping action.
We are probably better off moving those to more properly managed asynchronous tasks (celery, multiprocessing, etc.).
EDIT: Also fixes #353, although not by caring whether it's a 403.