mistralai[patch]: Added Json Mode for ChatMistralAI (#22213)
- **Description:** Powered
[ChatMistralAI.with_structured_output](https://github.com/langchain-ai/langchain/blob/fbfed65fb1ccff3eb8477c4f114450537a0510b2/libs/partners/mistralai/langchain_mistralai/chat_models.py#L609)
via json mode
- **Issue:** #22081
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Co-authored-by: Bagatur <baskaryan@gmail.com>
