[v5] 🚨Refactor subprocessors handling in processors (#41633)

* 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

* fix test modeling owlv2

* fix test_processing_layoutxlm

* Fix owlv2, wav2vec2, markuplm, voxtral issues

* add support for loading and saving multiple tokenizer natively

* remove exclude_attributes from save_pretrained

* modifs after review