[Fix] Add `original_max_position_embeddings` to YARN rope_scaling optional keys
Author: JustinTong0323
Pull request: yes

# What does this PR do?

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This PR adds support for the `original_max_position_embeddings` parameter in YARN rope scaling configurations, addressing compatibility issues with Qwen-32B series models.

The Qwen team requires this parameter for their YARN implementation in Qwen-32B models, ref: [link](https://huggingface.co/Qwen/QwQ-32B).

Previously, transformers would raise warnings about unrecognized keys despite this being a valid configuration parameter:

```
"rope_scaling": {
    "factor": 4.0,
    "original_max_position_embeddings": 32768,  # Previously unrecognized
    "type": "yarn"
}
```

Impact of this PR:
- Eliminates spurious warnings for Qwen-32B users
- Enables proper configuration validation for YARN-based models

This PR could also solves downstream issues:
https://github.com/sgl-project/sglang/issues/4145
https://github.com/vllm-project/vllm/issues/10293

Clarify #33783


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