Uniformize kwargs for Idefics/2 processors (#32568)
* Add uniformize idefics processor kwargs and tests
* Uniformize idefics2 processor kwargs
* add image_processor tests idefics
* add BC args order change idefics2 processor and update doc
* Add support for multiple images per prompt in image-text-to-text mode idefics
* Fix processor input args in idefics tests
* improve test processing common, remove unnecessary tests, update process uniformization
* fix doctrings idefics
* fix tests processors idefics/2
