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Prefer L0 backend to SYCL with dpcpp and GPU-aware Intel MPI

Mark Abraham requested to merge dpcpp_preferLevelZeroBackendWithIntelMpi into main

Intel MPI supports GPU-aware operations only on buffers created in contexts on devices with L0 backends to the SYCL runtime. So in the default case that devices with multiple backends are visible, GROMACS will be easier to use if it defaults to the only choice of backend that can work.

Refs #4638

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