Geo::ReverificationBatchWorker uses the LimitedCapacity::Worker
concern. For that concern to work correctly, we must periodically
reschedule jobs and perform cleanup by calling perform_with_capacity.
Before this commit, we were never calling perform_with_capacity on
Geo::ReverificationBatchWorker, meaning we never ran the cleanup code.
This commit fixes that by replacing perform_async with
perform_with_capacity.