Merge branch 'rez/api-for-managing-group-level-integrations' into 'master'

API for managing group-level integrations

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/179694



Merged-by: Luke Duncalfe <lduncalfe@gitlab.com>
Approved-by: Ashraf Khamis <akhamis@gitlab.com>
Approved-by: Luke Duncalfe <lduncalfe@gitlab.com>
Reviewed-by: Luke Duncalfe <lduncalfe@gitlab.com>
Reviewed-by: Rodrigo Tomonari <rtomonari@gitlab.com>
Reviewed-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Reviewed-by: Ashraf Khamis <akhamis@gitlab.com>
Co-authored-by: Rez <rmarandi@gitlab.com>