Fix CLI test checksums
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['The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_3892). All of your documentation changes will be reflected on that endpoint.'
 "Feel free to merge if it's good for you :)"
 "I've added a test @lhoestq. Once all green, I'll merge. "
 'Last failing tests do not have nothing to do with this PR.']
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Previous PR:
- #3796 

introduced a side effect: `datasets-cli test` generates `dataset_infos.json` with `None` checksum values.

See:
- #3805 

This PR introduces a way for `datasets-cli test` to force to record infos, even if `verify_infos=False`

Close #3848.

CC: @craffel 
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