Fix various cascades in bulk deletes
Fix various cascades in bulk deletes

- Add UserReport to project/group
- Add GroupMeta to project/group
- Add GroupEmailThread to project

beeftornado/sentry,zenefits/sentry,JamesMura/sentry,mvaled/sentry,nicholasserra/sentry,jean/sentry,ifduyue/sentry,JackDanger/sentry,alexm92/sentry,fotinakis/sentry,mvaled/sentry,daevaorn/sentry,zenefits/sentry,gencer/sentry,nicholasserra/sentry,daevaorn/sentry,gencer/sentry,daevaorn/sentry,ifduyue/sentry,alexm92/sentry,BuildingLink/sentry,JamesMura/sentry,BuildingLink/sentry,jean/sentry,JamesMura/sentry,alexm92/sentry,fotinakis/sentry,beeftornado/sentry,ifduyue/sentry,zenefits/sentry,looker/sentry,mvaled/sentry,looker/sentry,mvaled/sentry,JackDanger/sentry,BuildingLink/sentry,JackDanger/sentry,looker/sentry,zenefits/sentry,nicholasserra/sentry,jean/sentry,beeftornado/sentry,fotinakis/sentry,gencer/sentry,fotinakis/sentry,BuildingLink/sentry,daevaorn/sentry,looker/sentry,BuildingLink/sentry,ifduyue/sentry,JamesMura/sentry,looker/sentry,zenefits/sentry,jean/sentry,gencer/sentry,ifduyue/sentry,JamesMura/sentry,mitsuhiko/sentry,mvaled/sentry,gencer/sentry,mitsuhiko/sentry,mvaled/sentry,jean/sentry