Merge branch 'chore/remove-vendored-omniauth-azure-oauth2' into 'master'

Remove vendored omniauth-azure-oauth2

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142276



Merged-by: Aboobacker MK <akarakath@gitlab.com>
Approved-by: Smriti Garg <sgarg@gitlab.com>
Approved-by: David Dieulivol <ddieulivol@gitlab.com>
Co-authored-by: Roger Meier <r.meier@siemens.com>