Windows SDK version used for building packages

[CedricGuillemet]

Latest Windows SDK version seems to be used for Windows package build and release.
This forces user to use the latest version as well.
A variable in the build should be available to set it to a version compatible for most users.

[CedricGuillemet]

I'm taking a look

[CedricGuillemet]

More context:
All projects using c++ code need to use the same cppwinrt version. Otherwise, linking erros will popup.
For example, RNPermissions was not using the cppwinrt version used for RNW until this PR : https://github.com/zoontek/react-native-permissions/pull/860/files
BRN RNTA build is more explicit

BabylonReactNative/.github/workflows/pr.yml

Line 259 in 3ab1005

run: cmake -G "Visual Studio 16 2019" -D CMAKE_SYSTEM_NAME=WindowsStore -D CMAKE_SYSTEM_VERSION=10.0.19041.0 -DCMAKE_UNITY_BUILD=true -D CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION_MAXIMUM=10.0.19041.0 -A x64 ./../../../react-native-windows/windows

But next RNW version might change that number and if a user project is using a different version, then nothing will work.
One solution might be to package a .dll of BRN instead. This way, PDB might be packaged as well.