Implementing UI for external attachments #3593

Job	Run time
build_and_test (3.11, 22.x, :lint:python:client:common:smoke:stubs:)	4m 25s
build_and_test (3.11, 22.x, :server-1-of-2:)	7m 36s
build_and_test (3.11, 22.x, :server-2-of-2:)	10m 19s
build_and_test (3.11, 22.x, :gen-server:)	5m 51s
build_and_test (3.11, 22.x, :nbrowser-^[A-D]:)	2m 30s
build_and_test (3.11, 22.x, :nbrowser-^[E-L]:)	2m 40s
build_and_test (3.11, 22.x, :nbrowser-^[M-N]:)	2m 29s
build_and_test (3.11, 22.x, :nbrowser-^[O-R]:)	2m 43s
build_and_test (3.11, 22.x, :nbrowser-^[^A-R]:)	2m 39s
build_and_test (:lint:python:client:common:smoke:, 22.x, 3.10)	3m 20s
candidate	0s
	44m 32s

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