Move user schema tests to FAB provider (apache#37513)

Since all the USER/ROLE related code moved to FAB, we should also
move the user schema tests as well. Not having the tests in the
provider code, made the apache#37507 succeed because of selective chekcs
(false positive). Mobing the tests to fab provider should fix the
problem.

tests/api_connexion/schemas/test_user_schema.py → tests/providers/fab/auth_manager/api_endpoints/test_user_schema.py

@@ -31,8 +31,8 @@
 
 
 @pytest.fixture(scope="module")
-def configured_app(minimal_app_for_api):
-    app = minimal_app_for_api
+def configured_app(minimal_app_for_auth_api):
+    app = minimal_app_for_auth_api
     create_role(
         app,
         name="TestRole",