Move create_invoke_model_activity call to the end

Author: AnatoliB

samples-v2/openai_agents/function_app.py

@@ -7,8 +7,6 @@
 
 app = func.FunctionApp(http_auth_level=func.AuthLevel.FUNCTION)
 
-create_invoke_model_activity(app) # TODO: Can we hide this line?
-
 
 @app.route(route="orchestrators/{functionName}")
 @app.durable_client_input(client_name="client")
@@ -108,5 +106,11 @@ def human_in_the_loop(context):
 
     reaction = Runner.run_sync(writer, f"Your haiku is considered {event_data}. React emotionally.")
 
-    return reaction.final_output
- 
+    return reaction.final_output 
+
+
+#region Implementation details
+
+create_invoke_model_activity(app) # TODO: Can we hide this line?
+
+#endregion