Expose workflow client from Activity #2524

Job	Run time
cloud-test	0s
build-and-test (ubuntu-latest, oldstable)	16m 24s
build-and-test (ubuntu-latest, stable)	24m 36s
build-and-test (macos-intel, oldstable)	9m 46s
build-and-test (macos-intel, stable)	18m 7s
build-and-test (macos-arm, oldstable)	17m 12s
build-and-test (macos-arm, stable)	17m 3s
build-and-test (windows-latest, oldstable)	20m 31s
build-and-test (windows-latest, stable)	19m 6s
features-test / test	1m 54s
	2h 24m 39s

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