Terminal: [Scenario] Progress Bar Follow-ups

[zadjii-msft]

This is a list of tasks, bugs, etc, related to the "taskbar progress indicator", as first implemented in #8055. While not all of them are immediately relevant for the _taskbar_ indicator, they're all related to the showing of progress state in the Terminal.

Sequence	Description
`ESC ] 9 ; 4 ; st ; pr ST`	Set progress state on Windows taskbar and tab. When `st` is: * `0`: remove progress. * `1`: set progress value to `pr` (number, 0-100). * `2`: set the taskbar to the "Error" state * `3`: set the taskbar to the "Indeterminate" state * `4`: set the taskbar to the "Warning" state

Follow-up work:

• [ ] #3004 Display the progress in the taskbar (in PR: #8055)
• [ ] Display the progress in the tab itself (in PR: #8133)
• [ ] #7955 auto-detect progress, display in tab/taskbar
• [ ] Add a setting to let errors always be shown in the taskbar, regardless of which terminal pane is focused
• [ ] Add a setting to let errors auto-focus the pane with the error (doesn't focus the window, only re-focuses the tab hosting the pane and the pane itself) (in PR: #8145)
• [ ] Add a setting to let errors auto-focus the terminal window?

Bell notifications

These cover some of the same areas of the above, so I'm including them because I feel they deserve a mention here:

• [ ] Make terminal beeps highlight Windows Terminal in the taskbar, to get user attention when backgrounded #1608 (in PR: #8215)
• [ ] show an indicator if there's a bell in the tab #8106

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