fix: add missing call_type to more ProviderTrace callsites (#9266)

- letta_llm_request_adapter.py
- llm_api_tools.py

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letta/llm_api/llm_api_tools.py

@@ -245,6 +245,7 @@ def create(
                 request_json=prepare_openai_payload(data),
                 response_json=response.model_json_schema(),
                 step_id=step_id,
+                call_type="agent_step",
             ),
         )