Merge branch 'add-summarize-mr-AIGW-service' into 'master'

Add Summarize New MR AIGW Service.

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/172962



Merged-by: Vijay Hawoldar <vhawoldar@gitlab.com>
Approved-by: Emerald-Jayde Henao <ejhenao@gitlab.com>
Approved-by: Vijay Hawoldar <vhawoldar@gitlab.com>
Reviewed-by: Vijay Hawoldar <vhawoldar@gitlab.com>
Reviewed-by: Emerald-Jayde Henao <ejhenao@gitlab.com>
Reviewed-by: Michael Thomas <micthomas@gitlab.com>
Co-authored-by: Michael Thomas <micthomas@gitlab.com>