clean_backend_objects batch size can cause issues on slower systems
The current candlepin batch size for clean_backend_objects is 15,000 uuids at a time.
On slower systems, this can result in timeouts or other issues. 1,500 is more responsive (12 sec to return from candlepin on a slower system)
Fixes #24333 - lower batch size for c_b_o
clean_backend_objects can occasionally timeout on slower systems when
fetching the candlepin uuid list.
This commit reduces the batch size from 15,000 to 1,500. On a slower
system, this call returns in 12 seconds. At 15,000 the call took
multiple minutes; the time to completion did not scale linearly with
the batch size.