mpi: Drop dual mode and tweak overlap2/full modes for GPU backends #488

Job	Run time
pytest-docker-py310-gcc-omp-arm64-adjoint	26m 4s
pytest-docker-py310-icx-omp-base	43m 37s
pytest-docker-py310-gcc-omp-adjoint	27m 12s
pytest-docker-py310-gcc-omp-arm64-base	34m 30s
pytest-docker-py310-gcc-omp-base	41m 47s
pytest-docker-py310-icx-omp-adjoint	30m 51s
pytest-ubuntu-py311-gcc10-noomp-base	40m 49s
pytest-ubuntu-py310-gcc14-omp-base	47m 23s
pytest-ubuntu-py310-gcc9-omp-adjoint	27m 44s
pytest-ubuntu-py312-gcc12-cxxomp-base	1h 1m 39s
pytest-ubuntu-py313-gcc14-omp-adjoint	40m 48s
pytest-ubuntu-py313-gcc14-omp-base	54m 38s
pytest-osx-py312-clang-omp-base	38m 43s
pytest-ubuntu-py312-gcc13-omp-adjoint	40m 46s
pytest-ubuntu-py312-gcc13-omp-base	56m 29s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	32m 56s
pytest-ubuntu-py311-gcc10-noomp-adjoint	31m 40s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	43m 59s
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	40m 13s
pytest-ubuntu-py310-gcc14-omp-adjoint	35m 44s
pytest-ubuntu-py310-gcc9-omp-base	49m 10s
	14h 6m 42s

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