[6.15.z] Errata with swidtags setup and modular update

[Satellite-QE]

Cherrypick of PR: #14494

Problem Statement

Setup for contenthost of api::test_errata_installation_with_swidtags uses some outdated repositories and makes use of deprecated method repo_collection.setup_virtual_machine(). Has failed in most recent automation runs for 6.15, 6.14.3

Solution

Setup host with global registration to published CV and AK, with synced repos containing prereqs and module stream with swidtag attached, promoted CVV with all content. Also using SCA-only org fixture

Related Issues

• Failing contenthost setup or prereq install commands in recent 6.15 and 6.14 CI.
• these fixes have been included in an open CP for API::Errata-Management , which is not merged due to this failing test. This is now merged into 6.14.z ([6.14.z] CP of API-Errata modifications #13832)
  ^ We should CP to 6.14.z still, because review comments have brought enhancements to these fixes.

PRT case

trigger: test-robottelo
pytest: tests/foreman/api/test_errata.py::test_errata_installation_with_swidtags

[Satellite-QE]

trigger: test-robottelo
pytest: tests/foreman/api/test_errata.py::test_errata_installation_with_swidtags

[Satellite-QE]

PRT Result

Build Number: 6304
Build Status: SUCCESS
PRT Comment: pytest tests/foreman/api/test_errata.py::test_errata_installation_with_swidtags --external-logging
Test Result : ================== 1 passed, 4 warnings in 1383.03s (0:23:03) ==================