Merge branch '439371-integrations-form' into 'master'

Adds custom form for GAR integration settings

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144704



Merged-by: Artur Fedorov <afedorov@gitlab.com>
Approved-by: Aaron Huntsman <ahuntsman@gitlab.com>
Approved-by: Artur Fedorov <afedorov@gitlab.com>
Approved-by: Daniel Tian <dtian@gitlab.com>
Approved-by: Aman Luthra <aluthra@gitlab.com>
Reviewed-by: Artur Fedorov <afedorov@gitlab.com>
Reviewed-by: Rahul Chanila <rchanila@gitlab.com>
Co-authored-by: Rahul Chanila <rchanila@gitlab.com>