Ensure Steps with Either return types are able to be reflected in Memory

[mark-keaton]

There was an issue with a Step<WorkflowException, Either<Exception, Unit>> potentially not being picked up by Reflection for use in the Workflow memory.

The next Step had an Either type provided to it, but it was Bottom not Right or Left, meaning it wasn't instantiated properly (?).

We need to investigate that Either types are able to be return values.