worflows: activity retry policy #1223

Job	Run time
setup	16s
validate-example (actor)	2m 12s
validate-example (configuration)	1m 35s
validate-example (crypto)	1m 27s
validate-example (dist-scheduler)	1m 5s
validate-example (grpc-service)	2m 10s
validate-example (hello-world)	1m 2s
validate-example (pubsub)	1m 50s
validate-example (streamsub)	1m 8s
validate-example (service)	1m 52s
validate-example (socket)	54s
validate-example (workflow)	1m 27s
validate-example (workflow-parallel)	59s
	17m 57s

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