Progress: let window progress turn into silent notification progress

[bpasero]

Window progress is currently only showing in the status bar and if you have multiple, you can only see the last one. If instead we turn every window progress into a notification progress with the silent option, the progress would still only be reported in the status bar, but clicking it will show all pending progresses.

Verification

• create a simple extension that triggers progress using ProgressLocation.Window
• verify you see your progress message in the status bar as before
• verify you can click the progress message to see its notification
• verify this also works when you fire up multiple progresses at the same time, you should see all as notifications once clicked on the status bar