Remove unittest.main() calls (#11304)

Remove unittest.main() calls.

tests/unit/plugins/modules/test_keycloak_role.py

@@ -4,7 +4,6 @@
 
 from __future__ import annotations
 
-import unittest
 from contextlib import contextmanager
 from unittest.mock import patch
 
@@ -699,7 +698,3 @@ class TestKeycloakClientRole(ModuleTestCase):
 
         # Verify that the module's changed status matches what is expected
         self.assertIs(exec_info.exception.args[0]["changed"], changed)
-
-
-if __name__ == "__main__":
-    unittest.main()