Handle `OperationCanceledException` in RPC continuations #2132

Job	Run time
call-build-test / build-ubuntu	1m 25s
call-build-test / build-win32	4m 22s
call-build-test / sequential-integration-ubuntu	9m 23s
call-build-test / integration-ubuntu	5m 20s
call-build-test / integration-win32	10m 51s
call-build-test / sequential-integration-win32	19m 53s
	51m 14s

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