Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1981444

Description of problem:
"Subscription - Entitlement Report" in Katello uses the pool count incorrectly and double counts for hosts that share subscriptions.

Version-Release number of selected component (if applicable):
Katello 3.18 specifically, but really all versions of Katello.

How reproducible:
Always

Steps to Reproduce:
1. Attach the same subscriptions to multiple hosts
2. Generate a report from Monitor -> Report Templats -> "Subscription - Entitlement Report" -> Generate
3. Compare the value in the column "Subscriptions Consumed" with actual number of subscriptions attached to the host

Actual results:
Numbers don't match

Expected results:
Numbers match

Additional info:

This bug is in both the foreman and katello projects since changes need to be made to both repositories.