Update no_trainer.py scripts to include accelerate gradient accumulation wrapper
Author: Rasmusafj
Pull request: yes

# What does this PR do?
Updates no_trainer.py scripts to use the new gradient accumulation wrapper feature from accelerate according to #18436. 

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Comments:
_The documentation is not available anymore as the PR was closed or merged._

Let us know when the PR is ready for review (it's in draft mode right now) so we can go ahead and merge.

@sgugger  @muellerzr I changed PR to review. :)



@sgugger I removed changes to wav2vec script and fixed the using of wrong constant. 

Feel sure to merge if its fine. Its going to be squash merged right? or do i need to rebase and squash before merge?

We squash indeed. Thanks again for your contribution!