[wpiutil] Remove broken StackWalker library (#7777)

A Discord user reported that StackWalker gives blank stacktraces.

MSVC's C++23 support is unstable, so we can't use std::stacktrace yet.
In the meantime, we can just return an empty string and remove the
unmaintained StackWalker library and its hacky upstream_utils script.

wpiutil/src/main/native/cpp/RuntimeCheck.cpp

@@ -7,7 +7,7 @@
 #ifdef _WIN32
 #include <cstdio>
 #include <memory>
-
+#pragma comment(lib, "version.lib")  // for VerQueryValueW
 #include "Windows.h"
 extern "C" int32_t WPI_IsRuntimeValid(uint32_t* foundMajor,
                                       uint32_t* foundMinor,