FindCUDA/select_compute_arch: Restore two-component CUDA_VERSION

Brad Kingrequested to merge
brad.king/cmake:cuda-arch-version into master

Since !1856 (merged) this module sets CUDA_VERSION based on CMAKE_CUDA_COMPILER_VERSION when the language is enabled. Limit it to two components for consistency with the normal FindCUDA documentation and behavior.

Fixes: #18231

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