Merge branch 'support-ai-gateway-in-rails-ci' into 'master'

Support AI Gateway in Rails CI

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/148508



Merged-by: Jessie Young <jessieyoung@gitlab.com>
Approved-by: David Dieulivol <ddieulivol@gitlab.com>
Approved-by: Jessie Young <jessieyoung@gitlab.com>
Reviewed-by: David Dieulivol <ddieulivol@gitlab.com>
Co-authored-by: Shinya Maeda <shinya@gitlab.com>