Fix test for memory issues on Windows GH Actions

GitHub Actions was consistently failing on Windows instances with this
test. Likely cause was loading the large model files into memory, which
persisted until testing was completed. Since the rest of the model is
not needed, only return the service name and ID.

tests/functional/configured_endpoint_urls/test_configured_endpoint_url.py

@@ -166,7 +166,7 @@ def _known_service_names_and_models():
     result = []
     for service_name in available_services:
         model = my_session.get_service_model(service_name)
-        result.append((model.service_name, model))
+        result.append((model.service_name, model.service_id))
     return sorted(result)
 
 
@@ -192,12 +192,12 @@ def test_resolve_configured_endpoint_url(test_case, client_creator):
 
 
 @pytest.mark.parametrize(
-    'service_name,service_model', _known_service_names_and_models()
+    'service_name,service_id', _known_service_names_and_models()
 )
 def test_expected_service_env_var_name_is_respected(
-    service_name, service_model, client_creator
+    service_name, service_id, client_creator
 ):
-    transformed_service_id = service_model.service_id.replace(' ', '_').upper()
+    transformed_service_id = service_id.replace(' ', '_').upper()
 
     client = client_creator(
         service=service_name,
@@ -220,12 +220,12 @@ def test_expected_service_env_var_name_is_respected(
 
 
 @pytest.mark.parametrize(
-    'service_name,service_model', _known_service_names_and_models()
+    'service_name,service_id', _known_service_names_and_models()
 )
 def test_expected_service_config_section_name_is_respected(
-    service_name, service_model, client_creator
+    service_name, service_id, client_creator
 ):
-    transformed_service_id = service_model.service_id.replace(' ', '_').lower()
+    transformed_service_id = service_id.replace(' ', '_').lower()
 
     client = client_creator(
         service=service_name,