Show error state in progress ring of tab

# Description of the new feature/enhancement

If an application reports progress via OSC 9;4, Windows Terminal nowadays shows that in the task bar and in the tab header (). However, if the progress report has the error or warning state, that information goes only to the task bar. I'd like the tab header to display the error or warning, too.

Related to and .

# Proposed technical implementation details (optional)

Could perhaps change the color of the progress ring. I don't see any color or error property in [Microsoft.UI.Xaml.Controls.ProgressRing](https://docs.microsoft.com/windows/winui/api/microsoft.ui.xaml.controls.progressring?view=winui-2.5), though.

Start by tracing the existing OSC 9;4 progress handling and how progress is shown in the task bar and tab header. Compare the handling of error and warning states, then verify that those states are also represented in the tab header while normal progress remains unchanged.

Written by the indexing model from the issue text.