Test user level tasks

[alexr00]

Refs: #1435

• Windows @roblourens
• anyOS @sandy081 (not Windows)

Complexity: 3

In addition to having tasks in your .code-workspace file and in tasks.json in your open folder, you can now have tasks in a user level tasks.json next to your user settings.json.

• Open a folder that has some tasks. The vscode project is a good example.
• Run the Open User Tasks command to create a tasks.json file next to your user settings.json file.
• Add a shell or process type task to the new tasks.json. Only those two types of task are supported here.
• Run the Run Task command and verify that you see your new user level task. Verify that you can tell that it's a user level task in the task quick pick. Verify that you can configure your user level task by clicking the gear next to it in the quick pick. Verify that you can run the user task.
• Try running various other task commands and verify that the user task is handled in a predictable way.