Handle stream creation race condition #341
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When multiple workers start up at the same time, the create-group-then-delete-it logic needed for Redis stream creation can end up interleaved, e.g. two CREATEs then two DESTROYs. Redis will dutifully throw an error at that point because you asked it to delete something which has already gone.
In our case, that's fine - we only need to clean up the unused group, we don't care who deleted it.