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07cb41ea - community: aligning ChatLiteLLM default parameters with litellm (#30360)

community: aligning ChatLiteLLM default parameters with litellm (#30360) **Description:** Since `ChatLiteLLM` is forwarding most parameters to `litellm.completion(...)`, there is no reason to set other default values than the ones defined by `litellm`. In the case of parameter 'n', it also provokes an issue when trying to call a serverless endpoint on Azure, as it is considered an extra parameter. So we need to keep it optional. We can debate about backward compatibility of this change: in my opinion, there should not be big issues since from my experience, calling `litellm.completion()` without these parameters works fine. **Issue:** - #29679 **Dependencies:** None