Fix #301: WhenAll wait-all + aggregate-exception semantics (root caus… #327

Job	Run time
discover	6s
build (22.x)	23s
samples-with-emulator (hello-orchestrations, 22.x)	25s
samples-with-emulator (basics, 22.x)	32s
samples-with-emulator (human-interaction, 22.x)	37s
samples-with-emulator (retry-and-error-handling, 22.x)	31s
samples-with-emulator (unit-testing, 22.x)	36s
samples-with-emulator (versioning, 22.x)	33s
samples-with-emulator (lifecycle-management, 22.x)	35s
samples-with-emulator (query-and-history, 22.x)	41s
samples-no-emulator	0s
samples-gate	2s
	5m 1s

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