Fix PretrainedTokenizerFast check => Fix PretrainedTokenizerFast Save (#35835)
* Fix the bug in tokenizer.save_pretrained when saving tokenizer_class to tokenizer_config.json
* Update tokenization_utils_base.py
* Update tokenization_utils_base.py
* Update tokenization_utils_base.py
* add tokenizer class type test
* code review
* code opt
* fix bug
* Update test_tokenization_fast.py
* ruff check
* make style
* code opt
* Update test_tokenization_fast.py
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Co-authored-by: Qubitium-ModelCloud <qubitium@modelcloud.ai>
Co-authored-by: LRL-ModelCloud <165116337+LRL-ModelCloud@users.noreply.github.com>