Add 'none' reasoning effort to ChatCompletionRequest

[juliendenize]

Purpose

This PR adds support to 'none' reasoning effort.

This is something that is actually supported by the OpenAI client.

It is added to the ChatCompletionRequest but not to harmony.

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[gemini-code-assist]

Code Review

This pull request adds support for 'none' as a value for reasoning_effort. However, the implementation is incomplete and could lead to incorrect behavior. When reasoning_effort is set to 'none', include_reasoning still defaults to True, which should be False. I've left a comment with a suggested fix using a Pydantic validator. Additionally, this change lacks unit tests to verify the new behavior.

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Is mypy failing?

mypy is run differently in CI. If the failure is related to this check, please use the following command to run it locally:

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