Add new admin toggle for turning Enterprise on and off #2561

Job	Run time
build_and_test (3.11, 18.x, :lint:python:client:common:smoke:stubs:)	4m 49s
build_and_test (3.11, 18.x, :server-1-of-2:)	6m 4s
build_and_test (3.11, 18.x, :server-2-of-2:)	9m 47s
build_and_test (3.11, 18.x, :nbrowser-^[A-G]:)	11m 49s
build_and_test (3.11, 18.x, :nbrowser-^[H-L]:)	5m 20s
build_and_test (3.11, 18.x, :nbrowser-^[M-O]:)	11m 20s
build_and_test (3.11, 18.x, :nbrowser-^[P-S]:)	6m 7s
build_and_test (3.11, 18.x, :nbrowser-^[^A-S]:)	4m 52s
build_and_test (:lint:python:client:common:smoke:, 18.x, 3.10)	4m 38s
candidate	0s
	1h 4m 46s

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