Merge branch 'anti-abuse/180-aggregate-abuse-reports' into 'master'

Aggregate multiple abuse reports by the user & category (list-view)

Closes gitlab-org/modelops/anti-abuse/team-tasks#180

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/119282



Merged-by: Andy Soiron <asoiron@gitlab.com>
Approved-by: Siddharth Dungarwal <sdungarwal@gitlab.com>
Approved-by: Deepika Guliani <dguliani@gitlab.com>
Approved-by: Julia Miocene <jmiocene@gitlab.com>
Approved-by: Andy Soiron <asoiron@gitlab.com>
Reviewed-by: Andy Soiron <asoiron@gitlab.com>
Reviewed-by: David Pisek <dpisek@gitlab.com>
Reviewed-by: Deepika Guliani <dguliani@gitlab.com>
Co-authored-by: Hinam Mehra <hmehra@gitlab.com>