Test shell environment with tasks

[alexr00]

Refs: #108804

• macOS @gregvanl
• linux @alexdima
• windows @alexdima

Complexity: 3

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The goal is to verify that the environment variables in a task terminal haven't changed and are resolved correctly. i.e., your tasks have the same environment as VS Code. You can use the following task as a starting point, just open a folder, such as your clone of microsoft/vscode and add the following to .vscode/tasks.json:

		{
			"label": "Echo an env var",
			"type": "shell",
			"command": "echo",
			"args": [
				"${env:path}"
			]
		}

The "${env:path}" is the important part. More info.

To verify, run the "Run Task" command and choose the above task.

• Verify that the environment variable was resolved correctly.
• Try replacing path in the sample task with other variables that you expect to be set.