Fix get_ai.operation.name for responses api to `responses` instead of `chat`

[https://opentelemetry.io/docs/specs/semconv/registry/attributes/gen-ai/#gen-ai-operation-name](https://opentelemetry.io/docs/specs/semconv/registry/attributes/gen-ai/#gen-ai-operation-name) (<br>“If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.” and because the responses api also allows file and image input it is not really a chat completion