What does this PR do?

Uses a temp path to save local checkpoints for remote save paths.

This avoids issues where the current path has limits on file sizes or permission restrictions. This also enables more configurability because we can configure the default temp dir if needed.

Testing

Tested on interactive, saving to a remote dbfs path. You can see that the checkpoints are now saved to a local folder:

And the checkpoints are uploaded correctly to the remote location in mlflow artifacts:

What issue(s) does this change relate to?

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