Fix: adding pad_token_id in Qwen3VLTextConfig (#43398)
* Fix: adding pad_token_id in Qwen3VLTextConfig
* Fix: adding pad_token_id in Qwen3VLTextConfig
* updated the docstring with pad_token_id
* updated the docstring with pad_token_id
* added test nested in Qwen3VLModelTest for missing pad_token_id
* Updated pad_token_id config and removed the tests