[lm examples] replicate --config_overrides addition to other LM examples
This PR https://github.com/huggingface/transformers/pull/11798 created for `run_clm.py` which adds a new feature `--config_overrides` needs to be replayed for other scripts under `examples/pytorch/language-modeling/`.

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And thank you!
I am getting started with this task. <|||||>Thank you, @kumar-abhishek!