Add Nexus SignalWorkflowOperation #2488

Job	Run time
cloud-test (oldstable)	24s
build-and-test (ubuntu-latest, oldstable)	13m 59s
cloud-test (stable)	22s
build-and-test (ubuntu-latest, stable)	24m 41s
build-and-test (macos-intel, oldstable)	18m 1s
build-and-test (macos-intel, stable)	18m 30s
build-and-test (macos-arm, oldstable)	17m 5s
build-and-test (macos-arm, stable)	3m 50s
build-and-test (windows-latest, oldstable)	21m 49s
build-and-test (windows-latest, stable)	21m 52s
features-test / test	1m 58s
	2h 22m 31s

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