[6.15.z] CP: rhel_ver_match(N-x) Optional Format

[Satellite-QE]

Cherrypick of PR: #17090

Problem Statement

Partial cherry-pick of #16807 , adding ('N-x') format to parametrize marker rhel_ver_match for rhel contenthosts/clients.
Just CPing the fixture changes, as some new tests are also being CP'd to 6.16/6.15.z, with the N-x marker format.
Otherwise, the format is invalid for regex, so all distros are picked including fips.

Note: In 6.15.z and 6.16.z , RHEL9 is N (newest) in supportability.yaml. RHEL10 is only in Stream (6.17)

Example:

@pytest.mark.rhel_ver_match('N-2') # rhel9, 8, and 7  in 6.16 and 6.15
def test_case(rhel_contenthost, target_sat, ...):

PRT Case

trigger: test-robottelo
pytest: tests/foreman/cli/test_rhcloud_inventory.py -k 'test_positive_register_insights_client_host'

or tests/foreman/api/test_rhcloud_inventory.py -k 'test_rhcloud_scheduled_insights_sync'

[Satellite-QE]

trigger: test-robottelo
pytest: tests/foreman/cli/test_rhcloud_inventory.py -k 'test_positive_register_insights_client_host'

[Satellite-QE]

PRT Result

Build Number: 9551
Build Status: SUCCESS
PRT Comment: pytest tests/foreman/cli/test_rhcloud_inventory.py -k test_positive_register_insights_client_host --external-logging
Test Result : ========== 3 passed, 7 deselected, 109 warnings in 2070.62s (0:34:30) ==========