Make extension defined task types work in code-workspace files

- VSCode Version: 1.43.1 - OS Version: Windows 10 Steps to Reproduce: 1. Create new workspace 2. Add script in `scripts` of `package.json` as follow: `"buildfordebug": "tsc --project ./tsconfig.json --outDir ./out",` 3. Create default `tsconfig.json` 4. Setup `launch` in `workspace` with following configurations ``` "launch": { "version": "0.2.0", "configurations": [ { "type": "node", "request": "launch", "name": "Launch Program", "skipFiles": [ "<node_internals>/**" ], "program": "${workspaceFolder}/index.ts", "preLaunchTask": "buildfordebug", "outFiles": ["${workspaceFolder}/out/**/*.js"] } ] } ``` 5. Setup `tasks` in `workspace` with following configurations ``` "tasks": { "version": "2.0.0", "tasks": [ { "label": "buildfordebug", "group": "build", "type": "npm", "script": "buildfordebug", "presentation": { "reveal": "silent", "panel": "new" }, "problemMatcher": ["$tsc"] } ] } ``` 5. Launch debug by pressing F5 For easy demo, please clone it from [https://github.com/mannok/WorkspaceLaunchTaskDemo](https://github.com/mannok/WorkspaceLaunchTaskDemo) p.s. 1. Clone it 2. `npm install` 3. Press F5 ### **Error is then prompted as: Could not find the task 'buildfordebug'** <!-- Launch with `code --disable-extensions` to check. --> Does this issue occur when all extensions are disabled?: Yes