open_ai: Move from o1-preview to o1 for OpenAI Assistant provider (#23425)

- Closes: https://github.com/zed-industries/zed/issues/22521
- Follow-up to: https://github.com/zed-industries/zed/pull/22376
c450cd51eaPeter Tripp committed on 1/21/2025, 8:05:21 PM· committed by GitHubparent6eaaced
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