Remove deprecated
# What does this PR do?

This PR removes old deprecated arguments and adjust tests/examples accordingly.
Co-authored with @LysandreJik.
Hi, I noticed that https://github.com/huggingface/transformers/blob/master/examples/token-classification/run_ner_old.py#L294 and https://github.com/huggingface/transformers/blob/master/examples/token-classification/run_ner_old.py#L302 are still referencing is_world_master() instead of using is_world_process_zero(). I have made a change to run_ner_old.py locally and running the process again to see if it fixes the issue for me (AttributeError: 'Trainer' object has no attribute 'is_world_master')<|||||>We're not actively maintaining the old examples scripts anymore and they're still there for people using older versions of transformers. The good fix would be to add a minimum version to the README of that example.<|||||>I'm at loss here - which ones are old examples and which ones are new?

https://github.com/huggingface/transformers/issues/8792<|||||>If there should be an old version of something to be used with an old version of something - why not send users to the branch of that release that they want to use - they will end up with the version of examples that work for that release. And master examples should be working with master version of the code, IMHO.  Does it make sense?

If there are fixes to the old branch's examples, not pertaining to master, the fix can go into that branch.<|||||>Yes it all makes sense. Please be patient while I clean up the examples folder, as it's a long work. I promise this will all be clean when I'm done :-)