preLaunchTask on workspace configuration doesn't work

[alexr00]

From some discussion in #83065

workspace file:

	"tasks": {
		"version": "2.0.0",
		"tasks": [
			{
				"label": "My Task",
				"type": "shell",
				"command": "dir",
				"problemMatcher": []
			},
		]
	},
	"launch": {
		"configurations": [
			{
				"type": "node",
				"request": "attach",
				"name": "Attach",
				"port": 9229,
				"skipFiles": [
					"<node_internals>/**"
				],
				"preLaunchTask": "My Task" // Does not work
			}
		],
		"compounds": [
			{
				"name": "Compound",
				"configurations": ["Attach"],
				"preLaunchTask": "My Task" // Works great
			}
		]
	}

[isidorn]

This was never working, thus pushing to next milestone to fix then and not takcle as part of endgame.

[isidorn]

@alexr00 thanks for the nice steps, I have pushed a fix for this. Try it out and let me know how it behaves for you. I verified with your sample and it looks fixed for me.