fix ipython field in OpenAIToMessages class

[HuanzhiMao]

Context

What is the purpose of this PR? Is it to

• fix a bug

Please link to any issues this PR addresses.

Changelog

What are the changes made in this PR?

• Per the documentation, when using openai format dataset, the tool execution response should be added under the ipython role. But currently, it would give the following error ValueError: Tool or ipython message at index xx must follow an ipython message. This PR fixed this issue by introducing a minor update to the message processing logic in torchtune/data/_messages.py. The change ensures that the ipython field is properly included in the message object if present, defaulting to False otherwise.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/2906

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[krammnic]

Hey! We actually plan to remove ipython attribute completely. cc @joecummings