For the slint-compiler, we use ${CMAKE_SYSTEM_PROCESSOR}, which on Windows is - unfortunately - derived from the PROCESSOR_ARCHITECTURE environment variable, and
thus AMD64 or ARM64. Fix the package suffix on the CI side.
We could try to make the cmake variable to known values and then arm64/x86_64, but I'd rather stick with less exceptions when these names are not really visible in the documentation or our users.
The same applies to the C++ packages, where the CMake/Windows suffix (AMD64/ARM64) works better with FindSlint.cmake's use of the corresponding variable.
Similarly, the tool binaries were called
slint-viewer-windows-aarch64-pc-windows-msvc, but neither the compiler, nor the rest of the triplet is needed, merely the architecture. So rename it to slint-viewer-windows-arm64 and x86_64. Here we don't need cmake and can use the "correct" suffixes.
Python is missing, otherwise this builds windows arm64 binaries for the
tools, C++ packages, slint-compiler, npm binaries, and lsp binaries for
the VS code extension.
The {download_version} variable is either "nightly" or "vX.Y.Z", but the C++ binary packages dont have the "v" prefix. So use the plain version variable for the file name infix in the link.
Fixes#7242
