Merge branch '428072-add-count-fields-to-projects-index' into 'master'

Add migration to add count fields to projects

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144557



Merged-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Approved-by: Ravi Kumar <rkumar@gitlab.com>
Approved-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Reviewed-by: Terri Chu <tchu@gitlab.com>
Co-authored-by: Siddharth Dungarwal <sdungarwal@gitlab.com>