Add new admin toggle for turning Enterprise on and off #2613

Job	Run time
build_and_test (3.11, 18.x, :lint:python:client:common:smoke:stubs:)	4m 29s
build_and_test (3.11, 18.x, :server-1-of-2:)	6m 5s
build_and_test (3.11, 18.x, :server-2-of-2:)	9m 4s
build_and_test (3.11, 18.x, :nbrowser-^[A-G]:)	10m 57s
build_and_test (3.11, 18.x, :nbrowser-^[H-L]:)	5m 4s
build_and_test (3.11, 18.x, :nbrowser-^[M-O]:)	11m 28s
build_and_test (3.11, 18.x, :nbrowser-^[P-S]:)	6m 4s
build_and_test (3.11, 18.x, :nbrowser-^[^A-S]:)	4m 41s
build_and_test (:lint:python:client:common:smoke:, 18.x, 3.10)	4m 34s
candidate	0s
	1h 2m 26s

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