Backend disabled features

[streeve]

As the Kokkos backends develop, some features are disabled temporarily. This issue is to track those and re-enable when possible

HIP

• [x] MPI
• [x] VerletList
• [x] hierarchical parallel VerletList tests
• [ ] #658

OpenMPTarget

• [x] Cajita ArrayOp with reductions
• [x] Cajita grid_parallel_for
• [ ] Cajita ArrayOp reduction tests
• [ ] Cajita grid_parallel_for tests
• [ ] CSR VerletList tests
• [ ] NeighborList test initialization: random (done on host)
• [ ] HYPRE and heFFTe support

SYCL

• [x] #665
• [ ] HYPRE support

CUDA SYCL (jenkins)

• [x] MPI tests #442
• [x] Cajita tests #479
• [ ] Subset of MPI/Cajita tests
• [ ] Core tpl tests (just need to be enabled)
• [ ] Cajita tpl tests (just need to be enabled)