userspacegen: Mock setup_target_rhui_access_if_needed as no-op

The setup_target_rhui_access_if_needed() function is not covered by
tests and makes tests fail outside of containers because it calls
commands (api.run) which are not mocked.

Jira: OAMG-11647

repos/system_upgrade/common/actors/targetuserspacecreator/libraries/userspacegen.py

@@ -1266,6 +1266,7 @@ def perform():
             target_iso = next(api.consume(TargetOSInstallationImage), None)
             with mounting.mount_upgrade_iso_to_root_dir(overlay.target, target_iso):
 
+                # TODO: this is out of tests completely
                 setup_target_rhui_access_if_needed(context, indata)
 
                 target_repoids = _gather_target_repositories(context, indata, prod_cert_path)

repos/system_upgrade/common/actors/targetuserspacecreator/tests/unit_test_targetuserspacecreator.py

@@ -1213,6 +1213,7 @@ def test_perform_ok(monkeypatch):
     monkeypatch.setattr(overlaygen, 'create_source_overlay', MockedMountingBase)
     monkeypatch.setattr(userspacegen, '_gather_target_repositories', lambda *x: repoids)
     monkeypatch.setattr(userspacegen, '_create_target_userspace', lambda *x: None)
+    monkeypatch.setattr(userspacegen, 'setup_target_rhui_access_if_needed', lambda *x: None)
     monkeypatch.setattr(userspacegen.api, 'current_actor', CurrentActorMocked())
     monkeypatch.setattr(userspacegen.api, 'produce', produce_mocked())
     monkeypatch.setattr(repofileutils, 'get_repodirs', lambda: ['/etc/yum.repos.d'])