Test: 'restart' option for 'launch' requests

[weinand]

Test for #17381:
Complexity: 2

• Windows - @dbaeumer
• OS X - @joaomoreno
• Linux - @alexandrudima

For quite some time the VS Code node debugger supported a 'restart' attribute on 'attach' configurations. See https://code.visualstudio.com/docs/editor/node-debugging#_attaching-to-nodejs for details.
With this release we now support the 'restart' attribute on 'launch' configurations as well.
If this feature is enabled, VS Code will restart a debug session whenever it detects the termination of node.js.

An example for how to verify this feature uses nodemon and the following test program app.js:

let i = 0;

setInterval(() => {
	console.log('hello:' + i++);
}, 1000);

In your launch config you can use Intellisense snippets to create a 'Nodemon setup' launch config.
After launching this you can edit app.js and VS Code should restart the debug session automatically.

Try to verify another scenario that uses 'restart' in a 'launch' configuration.

[dbaeumer]

The other scenario I verified it a node application that I killed by hand. Restarted as well.

[joaomoreno]

This is very cool!