Implement cancellation notifications #312

Job	Run time
build (windows-latest, Release)	3m 16s
build (macos-latest, Release)	59s
build (ubuntu-latest, Release)	2m 4s
build (macos-latest, Debug)	52s
build (windows-latest, Debug)	3m 59s
build (ubuntu-latest, Debug)	1m 54s
publish-coverage / publish-coverage	31s
	13m 35s

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