helloworld: add terminal to node app for vscode

[jseguillon]

Description

When trying to debug helloworld app in vscode I noticed there is no terminal for node app which makes debugging not easy. This PR fixes this issue

Issue reference

#1124

Checklist

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

• The quickstart code compiles correctly
• You've tested new builds of the quickstart if you changed quickstart code
• You've updated the quickstart's README if necessary
• If you have changed the steps for a quickstart be sure that you have updated the automated validation accordingly. All of our quickstarts have annotations that allow them to be executed automatically as code. For more information see mechanical-markdown. For user guide with examples see Examples.

[paulyuk]

LGTM. thanks a lot for this improvement to the debugging experience.