Implementing UI for external attachments #3607

Job	Run time
build_and_test (3.11, 22.x, :lint:python:client:common:smoke:stubs:)	5m 30s
build_and_test (3.11, 22.x, :server-1-of-2:)	7m 24s
build_and_test (3.11, 22.x, :server-2-of-2:)	10m 28s
build_and_test (3.11, 22.x, :gen-server:)	5m 55s
build_and_test (3.11, 22.x, :nbrowser-^[A-D]:)	11m 40s
build_and_test (3.11, 22.x, :nbrowser-^[E-L]:)	10m 18s
build_and_test (3.11, 22.x, :nbrowser-^[M-N]:)	12m 6s
build_and_test (3.11, 22.x, :nbrowser-^[O-R]:)	5m 13s
build_and_test (3.11, 22.x, :nbrowser-^[^A-R]:)	7m 26s
build_and_test (:lint:python:client:common:smoke:, 22.x, 3.10)	5m 28s
candidate	0s
	1h 21m 28s

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