Merge branch 'send-unavailable-resources-to-aigw' into 'master'

Set unavailable resources in AI Gateway request when MR feature flag is enabled

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/164133



Merged-by: Gary Holtz <gholtz@gitlab.com>
Approved-by: Nathan Weinshenker <nweinshenker@gitlab.com>
Approved-by: Gary Holtz <gholtz@gitlab.com>
Co-authored-by: lesley <lrazzaghian@gitlab.com>