test(test_end_users.py): fix end user region routing test

proxy_server_config.yaml

@@ -1,9 +1,10 @@
 model_list:
   - model_name: gpt-3.5-turbo
     litellm_params:
-      model: azure/gpt-35-turbo
-      api_base: https://my-endpoint-europe-berri-992.openai.azure.com/
-      api_key: os.environ/AZURE_EUROPE_API_KEY
+      model: gpt-3.5-turbo
+      region_name: "eu"
+    model_info:
+      id: "1"
   - model_name: gpt-3.5-turbo
     litellm_params:
       model: azure/chatgpt-v-2

tests/test_end_users.py

@@ -167,7 +167,4 @@ async def test_end_user_specific_region():
             user=end_user_obj["user_id"],
         )
 
-        assert (
-            result.headers.get("x-litellm-model-api-base")
-            == "https://my-endpoint-europe-berri-992.openai.azure.com/"
-        )
+        assert result.headers.get("x-litellm-model-id") == "1"