Azure Durable Functions System.Threading.Tasks.TaskCanceledException

Used the template code from Visual Studio for an Azure Durable Function

**Investigative information**

- Durable Functions extension version: 1.7.1
- Function App version: 2.0
- Programming language used: C#

Steps to reproduce the behavior:
Run project under local development and invoke http orchestration trigger
curl -X GET \
http://localhost:7071/api/Function1_HttpStart

I am able to provide the entire project upon request

**Expected behavior**
Successful operation with zero exceptions

**Actual behavior**
Successful operation with ~20+ Exceptions
Exception thrown: 'System.Threading.Tasks.TaskCanceledException' in System.Private.CoreLib.dll
Exception thrown: 'System.Threading.Tasks.TaskCanceledException' in System.Private.CoreLib.dll
Exception thrown: 'System.Threading.Tasks.TaskCanceledException' in System.Private.CoreLib.dll
Exception thrown: 'System.Threading.Tasks.TaskCanceledException' in System.Private.CoreLib.dll
Exception thrown: 'System.Threading.Tasks.TaskCanceledException' in System.Private.CoreLib.dll
Exception thrown: 'System.Threading.Tasks.TaskCanceledException' in System.Private.CoreLib.dll
Exception thrown: 'System.Threading.Tasks.TaskCanceledException' in System.Private.CoreLib.dll
Exception thrown: 'System.Threading.Tasks.TaskCanceledException' in System.Private.CoreLib.dll

**Screenshots**
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**Additional context**

- Development environment: Visual Studio 15.9.4

Reproduce the issue by running the Visual Studio template locally and invoking the HTTP orchestration trigger with the provided curl command. Use the reported Durable Functions extension version 1.7.1 and Function App version 2.0, then determine whether the repeated TaskCanceledException events affect the successful operation; done means the trigger completes without the repeated exceptions.

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