Update no trainer scripts for multiple-choice
Author: kiansierra
Pull request: yes

# What does this PR do?
Update `run_swag_no_trainer` example to include `accelarator.gather_metrics`
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Related to #18437

I ran the script locally with the following arguments
```
"--dataset_name",
"swag",
"--dataset_config_name",
"regular",
"--model_type",
"bert",
"--tokenizer_name",
"bert-base-uncased"
```
## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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      Pull Request section?
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      to it if that's the case.
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      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?


## Who can review?
@muellerzr , @sgugger, @pacman100 
Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
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Models:

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Comments:
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