Revert "Avoid conflicts with hosting_backup_gc module - use separate namespace."

This reverts commit 2b52c2e4c485469ba360911e5ca4183a17a1b9c5.
Revert "Avoid conflicts with hosting_backup_gc module - use separate table."

This reverts commit 970a9bbda54cf218acfc3a6c3926922a932c7b76.