EVEREST-1788 Adjust `namespaces remove` CLI command #3456

Job	Run time
API Integration Tests (1.23.x, false)	15m 55s
CLI Integration Tests (1.23.x, false)	11m 8s
Check (1.23.x, false)	3m 41s
Test (1.23.x, false)	12m 9s
CLI tests (test-all-operators) / CLI test-all-operators	9m 46s
CLI tests (test-mongo-operator) / CLI test-mongo-operator	9m 9s
CLI tests (test-namespaces) / CLI test-namespaces	11m 21s
CLI tests (test-pg-operator) / CLI test-pg-operator	9m 8s
CLI tests (test-pxc-operator) / CLI test-pxc-operator	9m 14s
Merge Gatekeeper	14s
	1h 31m 45s

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