[deepspeed tests] fix issues introduced by #21700
https://github.com/huggingface/transformers/pull/21700 changed the default logging level - which broke multiple deepspeed tests.

Applying a hack to restore the log-level to how it was before.

_The documentation is not available anymore as the PR was closed or merged._<|||||>The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_21769). All of your documentation changes will be reflected on that endpoint.