Support mocking Nexus operation with operation reference #2223

Job	Run time
cloud-test (oldstable)	22s
cloud-test (oldstable)	22s
build-and-test (ubuntu-latest, oldstable)	16m 59s
build-and-test (ubuntu-latest, oldstable)	16m 59s
cloud-test (stable)	17s
cloud-test (stable)	17s
build-and-test (ubuntu-latest, stable)	25m 36s
build-and-test (ubuntu-latest, stable)	25m 36s
build-and-test (macos-intel, oldstable)	21m 1s
build-and-test (macos-intel, oldstable)	21m 1s
build-and-test (macos-intel, stable)	19m 22s
build-and-test (macos-intel, stable)	19m 22s
build-and-test (macos-arm, oldstable)	14m 3s
build-and-test (macos-arm, oldstable)	18m 13s
build-and-test (macos-arm, stable)	17m 14s
build-and-test (macos-arm, stable)	17m 14s
build-and-test (windows-latest, oldstable)	19m 56s
build-and-test (windows-latest, oldstable)	19m 56s
build-and-test (windows-latest, stable)	18m 41s
build-and-test (windows-latest, stable)	18m 41s
features-test / test	2m 11s
features-test / test	2m 11s
	5h 15m 34s

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