Batch seats exceeded notifications

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/102814



Merged-by: Tetiana Chupryna <tchupryna@gitlab.com>
Approved-by: Carla Drago <cdrago@gitlab.com>
Approved-by: Tetiana Chupryna <tchupryna@gitlab.com>
Co-authored-by: Ryan Cobb <rcobb@gitlab.com>