[Scenario] Progress Bar Follow-ups

[zadjii-msft]

[Original issue: #3004] [Initial PR: #8055] [Display the progress in the tab: #8133]

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
- [ ] #7955
- [ ] #1620
- [ ] #8449
- [ ] #9481
- [x] #8910
- [x] #10090
- [x] #9743
- [ ] #3991

"Auto-detect output, display in tab/taskbar" (#7955) and #1620 are very closely related

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 Make terminal beeps highlight Windows Terminal in the taskbar, to get user attention when backgrounded #1608 -> added in Add a setting to flash the taskbar when the terminal emits BEL #8215
• show an indicator if there's a bell in the tab Feature Request: show an indicator if there's a bell in the tab #8106 -> added in #8637
• The bell should "fade out", like it does for browsers
• More elaborate visual belling -> added in Add a setting to flash the pane when BEL is emitted #9270
  • bellStyle: flash -> flash the window. (maybe visual)
  • bellStyle: taskbar -> flash the taskbar (maybe taskbar)
  • bellStyle: visual -> both? (maybe visual|taskbar)

Related?

• Display connection state in tab & add tab context menu entry for restarting connection #14909

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