Utilise `PetscSection` to constrain essential boundary conditions #9178

Job	Run time
pytest-ubuntu-py311-gcc10-noomp-adjoint	29m 11s
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	34m 3s
pytest-ubuntu-py310-gcc9-omp-base	42m 35s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	28m 55s
pytest-ubuntu-py310-gcc9-omp-adjoint	23m 54s
pytest-ubuntu-py313-gcc14-omp-base	44m 2s
pytest-ubuntu-py310-gcc14-omp-base	43m 41s
pytest-osx-py312-clang-omp-base	30m 16s
pytest-docker-py310-gcc-omp-adjoint	25m 28s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	45m 17s
pytest-docker-py310-gcc-omp-arm64-base	30m 40s
pytest-docker-py310-gcc-omp-base	35m 28s
pytest-ubuntu-py311-gcc10-noomp-base	39m 7s
pytest-ubuntu-py312-gcc13-omp-base	46m 20s
pytest-docker-py310-gcc-omp-arm64-adjoint	22m 34s
pytest-docker-py310-icx-omp-adjoint	25m 58s
pytest-ubuntu-py312-gcc13-omp-adjoint	32m 18s
pytest-ubuntu-py313-gcc14-omp-adjoint	33m 31s
pytest-docker-py310-icx-omp-base	29m 46s
pytest-ubuntu-py312-gcc12-cxxomp-base	55m 43s
pytest-ubuntu-py310-gcc14-omp-adjoint	29m 38s
	12h 8m 25s

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