Improve Python code: address unused variables (#11049)

* Address F841 (unused variable).

* Reformat.

* Add changelog fragment.

* More cleanup.

* Remove trailing whitespace.

* Readd removed code as a comment with TODO.

tests/unit/plugins/modules/test_keycloak_user_federation.py

@@ -342,7 +342,6 @@ class TestKeycloakUserFederation(ModuleTestCase):
                 }
             ],
         ]
-        return_value_component_delete = [None]
         return_value_component_create = [
             {
                 "id": "eb691537-b73c-4cd8-b481-6031c26499d8",