azure-functions-durable-js: Adding extendedSessionsEnabled configuration causes the orchestration to be stuck in pending / running state.

Investigative information

• Durable Functions extension version: 1.8.0 and 1.8.3
• durable-functions npm module version: 1.2.2
• Language (JavaScript/TypeScript) and version: Javascript
• Node.js version: 10.14.1

Describe the bug Adding extendedSessionsEnabled configuration to host.json causes the orchestration to be stuck in pending / running state.

To Reproduce

• Create a function app in portal with node runtime
• Set the host.config to

{
  "version": "2.0",
  "extensionBundle": {
    "id": "Microsoft.Azure.Functions.ExtensionBundle",
    "version": "[1.*, 2.0.0)"
  },
  "extensions": {
    "durableTask": {
      "extendedSessionsEnabled": true,
      "extendedSessionIdleTimeoutInSeconds": 30
    }
  }
}

• Install durable-functions npm pacakge
• Create a function via durable functions templates
• Execute the function

Observed Behavior: After executing the durable function via httpStarter function. Going to the status uri shows that the function is stuck in pending / running state. Removing the extendedSessionsEnabled fixes the issue of being stuck in pending / running state.