Use CHPL_LLVM=system with CHPL_GPU=nvidia on ex test systems #26308
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Changes our test scripts to use CHPL_LLVM=system with CHPL_GPU=nvidia on ex test systems, since Chapel works with the system LLVM (which is currently LLVM 19). This should reduce the time spent running CUDA tests on these systems
[Reviewed by @ShreyasKhandekar]