## Summary of the Pull Request

Does what the title says. Now while you're building terminal projects,
the taskbar will show indeterminate progress. If the build fails, it'll
blink the error state for 500ms before returning to normal.

## References
* Made possible by #8055 _and viewers like you_

## PR Checklist
* [x] scratches an itch I've had since at least 2018
* [x] I work here
* [x] this is a build script

## Validation Steps Performed
tested manually

…8335)

## Summary of the Pull Request

Does what the title says. Now while you're building terminal projects,
the taskbar will show indeterminate progress. If the build fails, it'll
blink the error state for 500ms before returning to normal.

## References
* Made possible by microsoft#8055 _and viewers like you_

## PR Checklist
* [x] scratches an itch I've had since at least 2018
* [x] I work here
* [x] this is a build script

## Validation Steps Performed
tested manually

The terminal will show a "Indeterminate" state progress while the server is starting
See microsoft/terminal#8055 for more info

### What does this PR try to resolve?

A few terminal emulators support progress output to Windows taskbar.
`winget` uses this to show install progress.

Notably, Windows Terminal [recently (2020) added
support](microsoft/terminal#8055) for ANSI codes
[specified](https://conemu.github.io/en/AnsiEscapeCodes.html#ConEmu_specific_OSC)
in ConEmu (another terminal emulator for Windows) documentation. Also,
in "[Learn
Windows](https://learn.microsoft.com/en-us/windows/terminal/tutorials/progress-bar-sequences)".

I've found the previous attempt to add this feature:
#11436

As per @weihanglo's request, I've added the config option to
enable/disable this feature. **It's enabled on supported terminal
emulators.**

Fixes #11432

FCP:
#14615 (comment)

### How should we test and review this PR?

Run `cargo build` in Windows Terminal with configuration option
`term.progress.taskbar` set to `true`.

### Not sure

- [x] Should all the code be `#[cfg(windows)]`? Probably no, because the
feature is also usable in WSL.
> Solved by introducing heuristic based on environment variable set by
terminal

- [ ] If Ctrl+C is pressed, a progressbar will stay in a last state
forever (shown in the ConEmu video). `winget` is also behaves like
alike. I've experimented with `ctrl_c handler` and it's totally fixable.
- [x] `Enabled` is a sensible default for WSL because it works on linux
builds in Windows Terminal too
> Solved by introducing heuristic based on environment variable set by
terminal

- [x] Downloading stage may produce unpleasant blinking due to a rapid
0-100 changes
> Solved by not displaying bar when downloading and using indeterminate
state in other cases so amination don't reset

### TLDR

* An `term.progress.taskbar` option with bool type is added
* On Windows Terminal and ConEmu is enabled by default
* If enabled reports build progress to taskbar icon and/or tab header

### Videos

https://github.com/user-attachments/assets/48bb648a-e819-490e-b3ac-3502bc5f2f3a

https://github.com/user-attachments/assets/1d7ddf7a-34dd-4db1-b654-e64d7170798e