Add a test case for capsule content counts granularity

[vsedmik]

Problem Statement

In 6.17 capsule content counts will be updated separately for each CV when it is synced to the capsule and we should have a test case to cover that.

Solution

This PR just adds such a test case.

PRT test Cases example

Requires https://github.com/Katello/katello/pull/11176

trigger: test-robottelo
pytest: tests/foreman/cli/test_capsulecontent.py -k test_positive_content_counts_granularity
Katello:
    katello: 11176