Geo: Handle batch destroy for project_repositories based repo replication

Based on the instructions for adding a new replicable, for project_repositories based replication, we need to handle batch destroy:

Step 4. Handle batch destroy

If batch destroy logic is implemented for a replicable, then that logic must be "replicated" by Geo secondaries. The easiest way to do this is use Geo::BatchEventCreateWorker to bulk insert a delete event for each replicable.