ci: Restore MPI notebook testing #7119

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	51m 57s
pytest-ubuntu-py311-gcc11-noomp-adjoint	39m 36s
pytest-ubuntu-py312-gcc12-omp-base	1h 7m 26s
pytest-ubuntu-py312-gcc12-omp-adjoint	50m 33s
pytest-ubuntu-py39-gcc7-omp-base	52m 45s
pytest-ubuntu-py39-gcc7-omp-adjoint	40m 12s
pytest-ubuntu-py310-gcc10-noomp-base	51m 8s
pytest-ubuntu-py310-gcc10-noomp-adjoint	40m 10s
pytest-ubuntu-py312-gcc13-omp-base	1h 8m 6s
pytest-ubuntu-py312-gcc13-omp-adjoint	50m 40s
pytest-ubuntu-py39-gcc9-omp-base	53m 3s
pytest-ubuntu-py39-gcc9-omp-adjoint	40m 0s
pytest-osx-py312-clang-omp-base	33m 22s
pytest-docker-py39-gcc-omp-base	47m 19s
pytest-docker-py39-gcc-omp-adjoint	36m 5s
pytest-docker-py39-icx-omp-base	47m 3s
pytest-docker-py39-icx-omp-adjoint	43m 28s
	13h 32m 53s

Provide feedback