[6.13.z] - changes to use the beaker urls for running upstream sanity (#16549)

[omkarkhatavkar]

Cherrypick of PR: #16549

Problem Statement

Currently, the sanity tests are tightly coupled with "Oh Snap" for retrieving required repository URLs. This creates a dependency that hinders the flexibility of running the same tests with alternative URL sources, such as Beaker URLs. The reliance on "Oh Snap" is particularly limiting when running upstream sanity tests right after building the necessary bits. This dependency affects the ability to run tests in different environments efficiently.

Solution

This PR aims to decouple the sanity tests from "Oh Snap" by introducing a more flexible approach for handling repository URLs. Instead of relying exclusively on "Oh Snap" to fetch the URLs, we will modify the behaviour to allow passing the repository URLs directly through a repos file. This approach provides more control and adaptability, enabling tests to run seamlessly with either Beaker URLs or other sources without modifying the core logic.

By doing this, we improve the modularity of the tests, allowing upstream sanity runs to proceed immediately after building the necessary bits, enhancing efficiency and reducing dependencies on external services.

CI PR Dependancy

1504

Test Result

============================= test session starts ==============================
collecting ... collected 5450 items / 5439 deselected / 11 selected

tests/foreman/installer/test_installer.py::test_satellite_installation 
tests/foreman/api/test_computeresource_gce.py::TestGCEHostProvisioningTestCase::test_positive_gce_host_provisioned[sat] 
tests/foreman/api/test_organization.py::TestOrganization::test_positive_create_with_name_and_description[alphanumeric] 
tests/foreman/api/test_repository.py::TestRepositorySync::test_positive_sync_rh 
tests/foreman/api/test_user.py::TestUserRole::test_positive_create_with_role[1] 
tests/foreman/endtoend/test_api_endtoend.py::TestEndToEnd::test_positive_find_admin_user 
tests/foreman/installer/test_installer.py::test_capsule_installation

======= 12 passed, 5439 deselected, 5681 warnings in 3269.71s (0:54:29) ========

[omkarkhatavkar]

trigger: test-robottelo

[Satellite-QE]

PRT Result

Build Number: 8959
Build Status: SUCCESS
PRT Comment: pytest /opt/app-root/src/robottelo/tests/foreman -v -m build_sanity --external-logging
Test Result : ======= 11 passed, 5285 deselected, 5397 warnings in 2329.03s (0:38:49) ========