Remove explicit logging of GraphServiceException

[MaHa6543]

CoreHttpProvider.processResponse catches GraphServiceExceptions and writes the exception explicitly with logger.error.

This is not needed because the exception is also thrown afterwards (and can be handled individually by the caller).

The explicit logging should be removed so that the GraphServiceException is no longer written to log in each case.

[baywet]

Thanks for the suggestion. Would you be willing to submit a pull request to address this?

[MaHa6543]

Thanks for the quick response. I submitted pull request #898