Failing EmulatorFunctionalTests

[Preecington]

Whilst working on #203 I've noticed that the PR #251 has introduced failures into the EmulatorFunctionalTests, namely MockGenerationTest and MockRecreateOrchestrationTest.

This manifests as a timeout, but the underlying issue is the orchestration is continually retrying due to a corrupt state where there are Multiple ExecutionCompletedEvents in the history.

I managed to trace the issue down to something to do with the OrchestrationRuntimeState being passed in to CompleteTaskOrchestrationWorkItemAsync inside DurableTask.Core.TaskOrchestrationDispatcher.OnProcessWorkItemAsync (Line #402 on master as of this issue). Perhaps the local orchestration service wasn't properly updated to deal with the new raised event fix?

I won't have time to look at this for another few days, so I thought I'd just post my findings here.

[cgillum]

FYI @adarsh1