[VS Code] Local extension development: extension development host reloading doesn't work

Summary

When developing locally, when you start the Extension Development Host, you should be able to press CMD+R and that would relaod the window, using the latest extension sources. But because we use Terminate All Tasks tasks, the reload will kill the watch server.

This makes local development slower because you have to stop and start the host every time you make a change.

Steps to reproduce

1. Start the Run Extension launch task
2. When the Extension Development Host loads, press CMD+R

What is the current bug behavior?

The Build and watch Desktop sources task is killed

What is the expected correct behavior?

The Build and watch Desktop sources task keeps running after the CMD+R is pressed

Possible fixes

Note: If we remove the Terminate All Tasks task, the Build and watch Desktop sources task keeps running even after we close the Extension Development Host. That's the reason we introduced the Terminate task.