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New CUDA build warnings with C++20 #1942

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@rhornung67

There were a few of these before, but now there are a bunch of new warning compiler messages being emitted during compilation of Axom tests in a CUDA build. The warning involves passing long double to a device kernel.
That type is not supported on GPUs (NVIDIA or AMD) and is resolved to double by the compiler.

It's probably best to restrict the types used in device kernels in Axom tests to not include long double

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