Add support for args to ProcessorMixin for backward compatibility
Author: yonigozlan
Pull request: yes

# What does this PR do?
Split from https://github.com/huggingface/transformers/pull/32841 by @leloykun .
Add support for args inputs to processor calls for backward compatibility + improve generalization in ProcessorTesterMixin.
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Comments:
Looks like the test errors were unrelated to this PR, so it should be good to review now :). Also glad to see you back @molbap!

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_33479). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

Hey @molbap ! I made a few new modifications, mostly to fit Pixtral, but it still works for other processors. I also removed unnecessary tests for newly merged uniformized processors.
Main concern is about the scale_factor/ do_rescale part. Although it is a bit hacky, I do think it's the most generalizable test we can do on images kwargs.
Let me know if you think we can merge this :)