Add valid columns check in _remove_unused_columns method
Author: arthasking123
Pull request: yes

 
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Add valid columns check in _remove_unused_columns method to fix
https://github.com/huggingface/datasets/issues/6973
https://github.com/huggingface/datasets/issues/6535
This improvement helps users to quickly identify and resolve issues related to column matching between the dataset and the model's forward method.


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Comments:
 @muellerzr @SunMarc

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_31466). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

@muellerzr many thanks!

@amyeroberts would you please merge this PR? Thanks