[Bug]: response_format which is allowed_openai_params is not  supprted in NIM Models

### What happened?

response_format which is allowed_openai_params is not supprted in NIM Models.

### Relevant log output

```shell

```

### Are you a ML Ops Team?

No

### What LiteLLM version are you on ?

1.73.0

### Twitter / LinkedIn details

https://www.linkedin.com/in/shagunbansal/