feat: add a global executions_cancellable option #617

Job	Run time
Collect changes / collect-changes	5s
Python tests / lint-and-format-check	47s
Python tests / unit-tests (py313)	2m 53s
Python tests / types-check	1m 12s
Python tests / unit-tests (py312)	6m 20s
Python tests / unit-tests (py311)	2m 26s
Python tests / unit-tests (py310)	2m 18s
Python tests / unit-tests (py39)	2m 42s
status-check	1s
	18m 44s

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