Implementing UI for external attachments #3248

Job	Run time
build_and_test (3.11, 22.x, :lint:python:client:common:smoke:stubs:)	4m 41s
build_and_test (3.11, 22.x, :server-1-of-2:)	6m 52s
build_and_test (3.11, 22.x, :server-2-of-2:)	10m 14s
build_and_test (3.11, 22.x, :gen-server:)	5m 48s
build_and_test (3.11, 22.x, :nbrowser-^[A-D]:)	10m 36s
build_and_test (3.11, 22.x, :nbrowser-^[E-L]:)	9m 38s
build_and_test (3.11, 22.x, :nbrowser-^[M-N]:)	11m 42s
build_and_test (3.11, 22.x, :nbrowser-^[O-R]:)	4m 47s
build_and_test (3.11, 22.x, :nbrowser-^[^A-R]:)	7m 4s
build_and_test (:lint:python:client:common:smoke:, 22.x, 3.10)	4m 51s
candidate	0s
	1h 16m 13s

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