fix: Passing language as acronym to Whisper generate
Author: connor-henderson
Pull request: yes

# What does this PR do?
Fixes #23140 

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Comments:
_The documentation is not available anymore as the PR was closed or merged._

cc @sanchit-gandhi 

Thank you @sanchit-gandhi I made the requested changes and just have two callouts regarding the changes

One is I also realized we could use `TO_LANGUAGE_CODE.values()` instead of `LANGUAGES.keys()` for checking the acronym so I made that edit, and two is to keep that test fast I did a hacky setattr for the `generation_config` so it had some properties that `model.generate` is expecting it to have

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_23141). All of your documentation changes will be reflected on that endpoint.