Add Freebuff session restart option #516

Job	Run time
build-and-smoke-freebuff-windows	3m 18s
build-freebuff	1m 50s
e2e-help-command	1m 51s
e2e-code-edit	1m 32s
e2e-slash-commands	1m 15s
e2e-version	1m 33s
e2e-ads-behavior	1m 41s
e2e-terminal-command	1m 34s
e2e-startup	1m 30s
e2e-agent-startup	3m 7s
	19m 11s

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