Handle `OperationCanceledException` in RPC continuations #2207

Job	Run time
call-build-test / build-ubuntu	1m 8s
call-build-test / build-win32	3m 26s
call-build-test / integration-ubuntu	4m 5s
call-build-test / sequential-integration-ubuntu	9m 30s
call-build-test / integration-win32	10m 55s
call-build-test / sequential-integration-win32	20m 39s
	49m 43s

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