Test: notification progress API

[bpasero]

Refs: #44090

• any os @joaomoreno
• any os @rebornix

Complexity: 2

There is new API to show progress as a notification.

Verify:

• progress shows up as notification and optionally can show a cancel button
• progress can either show up infinite or discrete
• multiple progress items can show up at the same time

Sample code:

vscode.window.withProgress({
    location: vscode.ProgressLocation.Notification,
    title: "this is cool",
    cancellable: true
}, (progress, token) => {
    token.onCancellationRequested(() => {
        console.log("CANCELED")
    });

    setTimeout(() => {
        progress.report({ percentage: 10, message: "still going..."});
    }, 1000);

    setTimeout(() => {
        progress.report({ percentage: 50, message: "still going harder..."});
    }, 2000);

    setTimeout(() => {
        progress.report({ percentage: 90, message: "almost there..."});
    }, 3000);

    var p = new Promise(resolve => {
        setTimeout(() => {
            resolve();
        }, 5000);
    });

    return p;
});

[bpasero]

@rebornix you might want to test "out of sources" given the amount of fixes I already pushed that were uncovered by Joao.