[Unity] Set CMAKE_CUDA_ARCHITECTURES default to native

[vinx13]

CI images should also be updated to install cmake 3.24

cc @tqchen @junrushao @Lunderberg

[Lunderberg]

I like the change, and this makes sense to me.

[Lunderberg]

Since #16302 passed CI, and is now merged in as a temporary fix, can this PR also revert the changes from it?

[Lunderberg]

Thank you for the changes, and for handling the changes between TVM and the cutlass kernels!

[jwfromm]

Late to the party but just wanted to say i love this change. Thanks Wuwei!

[Lunderberg]

It looks like cmake's GPU detection isn't perfect (tested with cmake 3.26.4 and 3.27.7), and this can cause the following error to occur when trying to determine the cuda architectures to use.

CMake Error in CMakeLists.txt:                                    
  CUDA_ARCHITECTURES is set to "native", but no GPU was detected. 

I don't have a good long-term solution for this issue, but a current workaround is to explicitly call set(CMAKE_CUDA_ARCHITECTURES 75) in your config.cmake.