Simplify and standardize processor tests (#41773)
* remove attributes and add all missing sub processors to their auto classes
* remove all mentions of .attributes
* cleanup
* fix processor tests
* fix modular
* remove last attributes
* fixup
* fixes after merge
* fix wrong tokenizer in auto florence2
* fix missing audio_processor + nits
* Override __init__ in NewProcessor and change hf-internal-testing-repo (temporarily)
* fix auto tokenizer test
* add init to markup_lm
* update CustomProcessor in custom_processing
* remove print
* nit
* refactor processor tests first part
* refactor part 2
* fix test modeling owlv2
* fix test_processing_layoutxlm
* Fix owlv2, wav2vec2, markuplm, voxtral issues
* part3
* refactor all processor with mixin
* add support for loading and saving multiple tokenizer natively
* remove exclude_attributes from save_pretrained
* get processor from pretrained instead of components in tests
* skip tests in colqwen2, pixtral
* modifs after review
* fix style and copies
* Fix after review
* add test_processor_from_pretrained_vs_from_components, fix failing tests
* fix overflowing_tokens tests
* add config for layoutxlm
* fix ci
* use modular
* fic docstring
* Standardize mgp_str tests
* fix after review
