Automatically generate `preLaunchTask` task configurations for code-workspace

[award999]

Is your feature request related to a problem? Please describe.
Currently it is a known limitation that launch configurations at workspace scope cannot resolve a preLaunchTask that is in the workspaceFolder scope

Describe the solution you'd like
When auto-generate launch configuration is set and the scope is workspace we should generate the preLaunchTask task configurations into the workspace file as well

Describe alternatives you've considered
Other option is document this as a limitation

Additional context
This is a upstream VSCode limitation