Improve Freebuff session limit messaging (#721) #785

Job	Run time
build-and-smoke-freebuff-windows	2m 44s
build-freebuff	1m 14s
e2e-ads-behavior	1m 8s
e2e-version	1m 11s
e2e-slash-commands	56s
e2e-agent-startup	2m 9s
e2e-startup	1m 12s
e2e-help-command	1m 23s
e2e-code-edit	54s
e2e-terminal-command	58s
	13m 49s

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