Fixes needed - All are a must prior to publishing the code to upstream

The code references the internal (first problem) old and now broken (second problem) location for the rhos-release rpm inside roles/infrared-horizon-selenium/tasks/main.yml That should not happen, there is a specialized rhos-release task provided by infrared. Please use that. See for example plugins/tripleo-overcloud/build_templates.yml This change should allow you to cleanup all the code which calls rhos-release.
The code should not unconditionally enable the EPEL repository and keep it enabled, but just enable it when installing the relevant packages.
Please also don't include the .venv directory which is currently in the repository.

Future

Create a project and user for conducting the test. Clean up when done. This should replace the existing mechanism which creates/deletes the demo user
With python 3 you don't need to use virtualenv, but just create a venv with python3 -m venv.
Complement the above with: Use the 'pip' ansible task and thus replace a good part of roles/infrared-horizon-selenium/tasks/run_selenium_tests.yml See: docs.ansible.com/ansible/latest/collections/ansible/builtin/pip_module.html