If canceled attempted before, still allow attempting another cancel
in this case, attempt to send the sigterm signal again.
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Replace other cancel_callbacks with sigterm watcher
adapt special inventory mechanism for this too
Get rid of the cancel_watcher method with exception in main thread
Handle academic case of sigterm race condition
Process cancelation as control signal
Fully connect cancel method and run_dispatcher to control
Never transition workflows directly to canceled, add logs
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