Utilise `PetscSection` to constrain essential boundary conditions #9166

Job	Run time
pytest-ubuntu-py312-gcc13-omp-base	49m 49s
pytest-docker-py310-gcc-omp-adjoint	26m 47s
pytest-docker-py310-gcc-omp-arm64-adjoint	22m 43s
pytest-ubuntu-py310-gcc9-omp-adjoint	30m 41s
pytest-docker-py310-icx-omp-base	33m 55s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	31m 0s
pytest-ubuntu-py312-gcc13-omp-adjoint	31m 4s
pytest-osx-py312-clang-omp-base	31m 35s
pytest-docker-py310-gcc-omp-base	37m 39s
pytest-ubuntu-py310-gcc14-omp-base	44m 8s
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	37m 21s
pytest-docker-py310-gcc-omp-arm64-base	30m 1s
pytest-ubuntu-py310-gcc14-omp-adjoint	28m 14s
pytest-ubuntu-py311-gcc10-noomp-adjoint	29m 18s
pytest-docker-py310-icx-omp-adjoint	26m 41s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	43m 46s
pytest-ubuntu-py313-gcc14-omp-base	47m 10s
pytest-ubuntu-py310-gcc9-omp-base	42m 50s
pytest-ubuntu-py312-gcc12-cxxomp-base	54m 51s
pytest-ubuntu-py311-gcc10-noomp-base	39m 28s
pytest-ubuntu-py313-gcc14-omp-adjoint	31m 46s
	12h 30m 47s

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