[6.16.z] Fix test interference

[Satellite-QE]

Cherrypick of PR: #16267

Problem Statement

The test_negative_multi_cv_registration uses module_activation_key which uses module_sca_manifest_org which uploads a manifest to the module_org (which we don't actually need for the test case).
And there is another test in this module, test_syspurpose_end_to_end, which uses default_subscription fixture which uploads a manifest to the module_org too and here is where the interference happens since the second manifest upload fails with

['Owner has already imported from another subscription management application. The following conflicts were found: [ DISTRIBUTOR_CONFLICT ]']

Solution

Use module_ak_with_cv instead of module_activation_key - it does not upload any manifest and thus can't interfere with the other test.

PRT test Cases example

trigger: test-robottelo
pytest: tests/foreman/cli/test_host.py -k 'test_syspurpose_end_to_end or test_negative_multi_cv_registration'

[Satellite-QE]

trigger: test-robottelo
pytest: tests/foreman/cli/test_host.py -k 'test_syspurpose_end_to_end or test_negative_multi_cv_registration'

[Satellite-QE]

PRT Result

Build Number: 8570
Build Status: UNSTABLE
PRT Comment: pytest tests/foreman/cli/test_host.py -k test_syspurpose_end_to_end or test_negative_multi_cv_registration --external-logging
Test Result : = 1 failed, 2 passed, 93 deselected, 264 warnings, 1 error in 1208.40s (0:20:08) =

[vsedmik]

Same PRT result, as expected #16267 (comment)