Merge branch '374017-create-achievements-model-and-table' into 'master'

Create achievements model and database table

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/105871



Merged-by: Tiger Watson <twatson@gitlab.com>
Approved-by: Tiger Watson <twatson@gitlab.com>
Co-authored-by: Lee Tickett <ltickett@gitlab.com>
Co-authored-by: Niklas van Schrick <mc.taucher2003@gmail.com>