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 Katello/katello#11176

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

[vsedmik]

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

[Satellite-QE]

PRT Result

Build Number: 9005
Build Status: SUCCESS
PRT Comment: pytest tests/foreman/cli/test_capsulecontent.py -k test_positive_content_counts_granularity --external-logging
Test Result : ========== 1 passed, 27 deselected, 40 warnings in 3001.14s (0:50:01) ==========

[vsedmik]

Turning into draft until we resolve https://issues.redhat.com/browse/SAT-28743 and discuss the expected behaviour on step +c where we hit the issue from other side.