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VS: Add policy to build custom commands concurrently

Brad King requested to merge brad.king/cmake:vs-BuildInParallel into master

In !8093 (merged) we added BuildInParallel to custom commands in .vcxproj files, but that had to be reverted by !8297 (merged) because some projects may have custom commands that accidentally rely on serial execution in MSBuild.

Add a policy to use BuildInParallel for custom commands in projects that have been updated to set the policy to NEW.

Also disallow FindCUDA with CMP0147 under Visual Studio. Its custom commands invoke nvcc, which invokes cl. Under VS this is done without a /FS flag, so .pdb generation races if we use BuildInParallel. The FindCUDA module has already been removed by policy CMP0146 after being deprecated since CMake 3.10, so it is simplest to just disallow this combination of features.

Fixes: #18405 (closed)
Issue: #24576 (closed)

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