Fix weight loading of `weight_g_idx` compressed-tensors parameters
Author: dsikka
Pull request: yes

# What does this PR do?

- There is currently a check in `modeling_utils.py` which replaces parameters  with the `weight_g` substring in the parameter key with `parametrizations.weight.original0`. This incorrectly replaces the substring of `compressed-tensors` model parameters with the key `weight_g_idx`, resulting in a loading error. 

https://github.com/huggingface/transformers/blob/02a492a8384abc2fa22516f859e17e8528dd1aa6/src/transformers/modeling_utils.py#L4380

- Updates the `src/transformers/quantizers/quantizer_compressed_tensors.py` logic to temporarily turn off the `weight_norm` attribute such that the substring replacement does not occur in `modeling_utils.py` during weight loading. It then turns it back on in `_process_model_after_weight_loading`. This allows the models to be loaded correctly

## Before submitting
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## Who can review?

@SunMarc 
@ArthurZucker 

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Comments:
This is also discussed in the latest fix for `gamma`/ `beta` renaming #35615 

 - https://github.com/huggingface/transformers/pull/35615#issuecomment-2590567179
 
And already should be fixed, because the above PR introduced `.endswith("weight_v")` change.

@dsikka please update to the latest source code from `main` and let us know if you still face any issues, thanks 🤗 

perfect timing, that PR fixes our issue.

Thanks for linking!