[Bug]: When using service_tier responses are not logged in langfuse (Otel)

### What happened?

when using the service_tier parameters with an OpenAI model ( responses endpoint) only the prompt is logged in langfuse. The answer is to logged

The answer is correctly logged in litellm 

### Relevant log output

```shell

```

### Are you a ML Ops Team?

Yes

### What LiteLLM version are you on ?

Last main

### Twitter / LinkedIn details

_No response_