Merge branch '487435-prevent-zero-projects-stars-decrement' into 'master'

Prevent decremeting stars of project with zero star count

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183481



Merged-by: Marcos Rocha <mrocha@gitlab.com>
Approved-by: Terri Chu <tchu@gitlab.com>
Approved-by: Jorge Cook <jcook@gitlab.com>
Approved-by: Marcos Rocha <mrocha@gitlab.com>
Reviewed-by: Terri Chu <tchu@gitlab.com>
Reviewed-by: Jorge Cook <jcook@gitlab.com>
Co-authored-by: Shane Maglangit <smaglangit@gitlab.com>