Fix disconnected stream retention (#683) #709

Job	Run time
build-and-smoke-freebuff-windows	2m 34s
build-freebuff	1m 7s
e2e-slash-commands	1m 0s
e2e-ads-behavior	1m 18s
e2e-agent-startup	2m 20s
e2e-code-edit	59s
e2e-terminal-command	58s
e2e-help-command	1m 23s
e2e-version	1m 4s
e2e-startup	1m 12s
	13m 55s

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