[wpiutil] Use C++23 stacktrace library on Windows

[calcmogul]

This lets us remove the unmaintained StackWalker library and its hacky upstream_utils script.

@Gold856 reported that StackWalker gives blank stacktraces: https://discord.com/channels/176186766946992128/368993897495527424/1261940029287301150. They also reported an earlier version of this PR giving the following stacktrace instead:

D:\allwpilib\developerRobot\src\main\native\cpp\Robot.cpp(18): developerRobotCpp!Robot::RobotInit+0xB6
D:\allwpilib\wpilibc\src\main\native\cpp\TimedRobot.cpp(22): wpilibcd!frc::TimedRobot::StartCompetition+0x4F
D:\allwpilib\wpilibc\src\main\native\include\frc\RobotBase.h(36): developerRobotCpp!frc::impl::RunRobot<Robot>+0xC8
D:\allwpilib\wpilibc\src\main\native\include\frc\RobotBase.h(106): developerRobotCpp!frc::StartRobot<Robot>+0x17E
D:\allwpilib\developerRobot\src\main\native\cpp\Robot.cpp(60): developerRobotCpp!main+0xB
D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl(79): developerRobotCpp!invoke_main+0x39
D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl(288): developerRobotCpp!__scrt_common_main_seh+0x132
D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl(331): developerRobotCpp!__scrt_common_main+0xE
D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_main.cpp(17): developerRobotCpp!mainCRTStartup+0xE
KERNEL32!BaseThreadInitThunk+0x1D
ntdll!RtlUserThreadStart+0x28

[ThadHouse]

Hmm. This might be a problem. I'm not sure if mixing /std:c++latest and /std:c++20 is safe, and team programs would still be c++ 20. c++latest technically isn't ABI safe across runtime releases.

[calcmogul]

From what I've read, /std:c++latest isn't guaranteed to have stable standard support. MSVC doesn't have a /std:c++23 flag yet either, tho they've had std::stacktrace support since VS 17.4 (released November 2022).

[ThadHouse]

Let me see if theres a way in gradle to just set that one file to c++latest, at least for the gradle build. I'd prefer limiting the scope as much as possible.

[PeterJohnson]

Does it need to be set to c++latest to use std::stacktrace?

[calcmogul]

Yes. https://godbolt.org/z/W4WWrc9qG

[ThadHouse]

Honestly, until MSVC gets a /std:c++23 flag, this really can't be merged. We cannot ship libraries targeting /std:c++latest safely at all.

[PeterJohnson]

While we're waiting for the C++23 final version to land in MSVC, if StackWalker is non-functional, we can just remove it in the meantime (and just return an empty string).

[calcmogul]

Here's the StackWalker removal PR: #7777