Implementing UI for external attachments #3240

Job	Run time
build_and_test (3.11, 22.x, :lint:python:client:common:smoke:stubs:)	4m 37s
build_and_test (3.11, 22.x, :server-1-of-2:)	2m 36s
build_and_test (3.11, 22.x, :server-2-of-2:)	2m 36s
build_and_test (3.11, 22.x, :gen-server:)	5m 29s
build_and_test (3.11, 22.x, :nbrowser-^[A-D]:)	10m 42s
build_and_test (3.11, 22.x, :nbrowser-^[E-L]:)	9m 37s
build_and_test (3.11, 22.x, :nbrowser-^[M-N]:)	11m 58s
build_and_test (3.11, 22.x, :nbrowser-^[O-R]:)	4m 52s
build_and_test (3.11, 22.x, :nbrowser-^[^A-R]:)	7m 3s
build_and_test (:lint:python:client:common:smoke:, 22.x, 3.10)	4m 36s
candidate	0s
	1h 4m 6s

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