Splitting long groups page

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/121284



Merged-by: Dylan Griffith <dyl.griffith@gmail.com>
Approved-by: Jon Glassman <jglassman@gitlab.com>
Approved-by: Dylan Griffith <dyl.griffith@gmail.com>
Approved-by: Tristan Read <tread@gitlab.com>
Co-authored-by: Suzanne Selhorn <sselhorn@gitlab.com>