copilot_chat: Rename `o1-preview` model to `o1` (#23038)

https://github.blog/news-insights/openais-o1-model-available-in-copilot-chat-and-github-models/

Release Notes:

- Renamed Github Copilot Chat "o1-preview" model to "o1".

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Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>
955248fee0SkywardSyntax committed on 1/13/2025, 3:32:26 PM· committed by GitHubparent7ed834b
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