[`Mistral Tokenizers`] Fix tokenizer detection (#42389)
* fix
* sanity check
* style
* comments
* make it v5 explicit
* make explicit fixes possible in local tokenizers
* remove hub usage on local
* fix
* extend test for no config case
* move mistral patch outside to separate fn
* fix local path only
* add a tes
* make sure test does not pass before this PR
* styling
* make sure it exists
* fix
* fix
* rename
* up
* last nit i hope lord
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Co-authored-by: Arthur <arthur.zucker@gmail.com>
