Draft: Add ai-gateway-with-duo-enterprise job
What does this MR do and why?
Related https://gitlab.com/gitlab-org/gitlab/-/issues/470657
With gitlab-qa!1369 (merged), we allow new Gitlab instance setup to enable Duo Enterprise add-on. Add job to trigger this setup
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.