[codex] Add server-side Composio managed auth #845

Job	Run time
build-and-smoke-freebuff-windows	2m 48s
build-freebuff	1m 19s
e2e-version	52s
e2e-slash-commands	1m 8s
e2e-startup	1m 7s
e2e-help-command	1m 1s
e2e-ads-behavior	1m 14s
e2e-code-edit	58s
e2e-agent-startup	2m 1s
e2e-terminal-command	58s
	13m 26s

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