[codex] Add server-side Composio managed auth #837

Job	Run time
build-and-smoke-freebuff-windows	15s
build-freebuff	1m 11s
e2e-version	1m 2s
e2e-help-command	1m 19s
e2e-terminal-command	1m 7s
e2e-agent-startup	2m 9s
e2e-code-edit	52s
e2e-startup	1m 9s
e2e-slash-commands	1m 9s
e2e-ads-behavior	1m 5s
	11m 18s

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