`local_files_only` is not passed to `_from_pretrained` in `PreTrainedTokenizerBase.from_pretrained`
I run
```python
processor = CLIPProcessor.from_pretrained("openai/clip-vit-base-patch32", local_files_only=True)
```
But request is still sent to get etag.
https://github.com/huggingface/transformers/blob/b2e4b091f08f1aaf21855d588c6c8d284baba9eb/src/transformers/tokenization_utils_base.py#L1653-L1813
`local_files_only` is aborted when calling `_from_pretrained`, whether it is explicitly passed or implicitly set by `is_offline_mode()` check.
I think this behavior is buggy.
Fortunately, `transformers` check `is_offline_mode()` in `utils/hub.py/cached_path`, so I can globally and permanently force `local_files_only` as a workaround in my usecase.

Only fixing `PreTrainedTokenizerBase.from_pretrained` is not enough, `_from_pretrained` doesn't pass `local_files_only` to `AutoConfig.from_pretrained` either.
I'm working on a fix for it.