Yocto SDK should not ship foreign arch Qt6FooToolsConfig.cmake files without shipping the binaries as well

We ship the foreign arch CMake files in the SDK, but not the actual binaries.

If at any point the foreign CMake files are picked up by find_package, CMake will error out saying the referenced binaries don't exist on disk.

I was told we don't ship the binaries in the SDK because it doesn't make sense to have them there, they are only included in the image, which makes sense.

But then we shouldn't ship the CMake files either.

$ fd tracegen
sysroots/x86_64-pokysdk-linux/usr/libexec/tracegen

$ fd Qt6CoreConfig.cmake
sysroots/x86_64-pokysdk-linux/usr/lib/cmake/Qt6Core/Qt6CoreConfig.cmake
sysroots/skylake-64-poky-linux/usr/lib/cmake/Qt6Core/Qt6CoreConfig.cmake