Ignore mosaicml logger for exception if excephook is active (#1301)
* ignore logger if excephook is active
* remove logger in data scripts and callback
* undo format of imports
* moved env var check into helper
* formatted
* removed import format
* added docstring
* ran pre-commit
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Co-authored-by: Daniel King <43149077+dakinggg@users.noreply.github.com>