chore: remove legacy registry passthrough from core #1466

Job	Run time
test-suite (active-standby-kubernetes)	20m 45s
test-suite (api)	27m 24s
test-suite (deploytarget)	19m 43s
test-suite (features-kubernetes)	26m 50s
test-suite (features-kubernetes-2)	28m 55s
test-suite (features-variables)	23m 42s
test-suite (services)	22m 24s
test-suite (tasks)	19m 45s
	3h 9m 28s

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