Bad exception handling in OrderGroupWorkflowManager.RunWorkflow

Description

OrderGroupWorkflowManager.RunWorkflow takes a parameter to indicate if it should throw exception or not. However, this is less than optimal:

• It should log the exception as an error, or at a least warning, not debug.
• It should log the exception regardless of the flag.

This makes debugging problems in Commerce Manager very cumbersome because it actively hides exceptions that happen in the workflows.