fix(openai): remove response_format in model distil feat

[hassiebp]

Important

Remove response_format from metadata in get_openai_args() to comply with OpenAI's metadata restrictions during model distillation.

• Behavior:
  • In get_openai_args() in openai.py, remove response_format from metadata if present when store is True.
  • This change addresses OpenAI's restriction on non-string metadata values during model distillation.

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[greptile-apps]

Disclaimer: Experimental PR review

PR Summary

Fixes an issue with OpenAI's model distillation feature by removing 'response_format' from metadata to prevent API errors when using non-string values.

• Modified langfuse/openai.py to exclude 'response_format' key from metadata when using model distillation to ensure compatibility with OpenAI's API requirements
• Prevents potential runtime errors when using OpenAI's model distillation with complex response format objects
• Maintains core functionality while ensuring metadata only contains string-compatible values

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