Fixes class of canceled on client issues

[paulyuk]

Description

This fixes #595 and class of canceled on client errors seen in the workflow API examples.

I observed that:

• workflowRuntime.stop() is being called in the start() method

A fixed I used is to:

• move workflowRuntime.stop() to a process on SIGTERM function/handler

process.on('SIGTERM', () => {
  workflowRuntime.stop();
})

• move the declarations of workflowRuntime out of start and into the file scope, along with daprHost and daprPort so they are all visible to the new process.on SIGTERM handler

Issue reference

Please reference the issue this PR will close: #595

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[BlackRider97]

grpc/grpc-node#2233

Proper fix would be adding error handler to take care of CANCELLED status. Although it is not critical for tutorials but for general javascript SDK client, it should be handled

[paulyuk]

will take a look. thank you for this

[DeepanshuA]

Agreed, it would need a better handling through some error handler kind of mechanism.

[paulyuk]

We believe this is not right fix now.