Shutdown Doc worker when it is not considered as available in Redis #831 #1715

Job	Run time
build_and_test (3.9, 18.x, :lint:python:client:common:smoke:)	4m 19s
build_and_test (3.9, 18.x, :server-1-of-2:)	11m 30s
build_and_test (3.9, 18.x, :server-2-of-2:)	11m 22s
build_and_test (3.9, 18.x, :nbrowser-^[A-G]:)	15m 3s
build_and_test (3.9, 18.x, :nbrowser-^[H-L]:)	4m 18s
build_and_test (3.9, 18.x, :nbrowser-^[M-O]:)	11m 16s
build_and_test (3.9, 18.x, :nbrowser-^[P-S]:)	5m 51s
build_and_test (3.9, 18.x, :nbrowser-^[^A-S]:)	4m 27s
build_and_test (:lint:python:client:common:smoke:, 18.x, 3.10)	3m 23s
build_and_test (:lint:python:client:common:smoke:, 18.x, 3.11)	3m 52s
candidate	0s
	1h 15m 21s

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