Add support for standalone activity cancellation #21958

Job	Run time
build-docker-image / build-image	7m 27s
feature-tests-dotnet / test	1m 33s
feature-tests-ts / test	2m 32s
feature-tests-java / test	2m 10s
feature-tests-go / test	2m 27s
feature-tests-python / test	1m 43s
Tests Status	2s
	17m 54s

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