Python: Durabletask: Provide with a consistent way to raise errors from DurableTask Task #3130

In the new durabletask package for Python, we've introduced a new CompositeTask to help with converting the response back from Entity to AgentRunResponse type.

The challenge with this is that there is no good way to propagate an error back to the caller if the conversion fails for some reason - #3058 (comment)

This task is to track this dependency on the durabletask package until they provide for an easy and reliable way to fail a Task.

Open PR - microsoft/durabletask-python#99

cc: Chris Gillum (@cgillum) andystaples Varad Meru (@vrdmr)