make access control for ConvertFromColumn action less brutal #2541

Job	Run time
build_and_test (3.11, 18.x, :lint:python:client:common:smoke:stubs:)	4m 33s
build_and_test (3.11, 18.x, :lint:python:client:common:smoke:stubs:)	4m 33s
build_and_test (3.11, 18.x, :server-1-of-2:)	5m 49s
build_and_test (3.11, 18.x, :server-1-of-2:)	5m 49s
build_and_test (3.11, 18.x, :server-2-of-2:)	9m 19s
build_and_test (3.11, 18.x, :server-2-of-2:)	9m 19s
build_and_test (3.11, 18.x, :nbrowser-^[A-G]:)	11m 13s
build_and_test (3.11, 18.x, :nbrowser-^[A-G]:)	11m 13s
build_and_test (3.11, 18.x, :nbrowser-^[H-L]:)	5m 9s
build_and_test (3.11, 18.x, :nbrowser-^[H-L]:)	5m 9s
build_and_test (3.11, 18.x, :nbrowser-^[M-O]:)	11m 51s
build_and_test (3.11, 18.x, :nbrowser-^[M-O]:)	11m 51s
build_and_test (3.11, 18.x, :nbrowser-^[P-S]:)	6m 42s
build_and_test (3.11, 18.x, :nbrowser-^[P-S]:)	6m 42s
build_and_test (3.11, 18.x, :nbrowser-^[^A-S]:)	4m 37s
build_and_test (3.11, 18.x, :nbrowser-^[^A-S]:)	4m 31s
build_and_test (:lint:python:client:common:smoke:, 18.x, 3.10)	4m 42s
build_and_test (:lint:python:client:common:smoke:, 18.x, 3.10)	4m 42s
candidate	0s
candidate	0s
	2h 7m 44s

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