Utilise `PetscSection` to constrain essential boundary conditions (#2… #9179

Job	Run time
pytest-ubuntu-py310-gcc14-omp-base	41m 6s
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	35m 7s
pytest-docker-py310-gcc-omp-arm64-base	29m 24s
pytest-osx-py312-clang-omp-base	26m 22s
pytest-docker-py310-gcc-omp-adjoint	25m 16s
pytest-ubuntu-py310-gcc14-omp-adjoint	29m 24s
pytest-ubuntu-py310-gcc9-omp-base	42m 48s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	44m 15s
pytest-ubuntu-py312-gcc13-omp-adjoint	31m 20s
pytest-ubuntu-py312-gcc13-omp-base	47m 35s
pytest-ubuntu-py312-gcc12-cxxomp-base	54m 48s
pytest-ubuntu-py310-gcc9-omp-adjoint	31m 7s
pytest-ubuntu-py311-gcc10-noomp-base	41m 7s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	30m 42s
pytest-ubuntu-py311-gcc10-noomp-adjoint	28m 57s
pytest-docker-py310-icx-omp-adjoint	26m 58s
pytest-docker-py310-gcc-omp-arm64-adjoint	22m 25s
pytest-docker-py310-gcc-omp-base	36m 8s
pytest-ubuntu-py313-gcc14-omp-base	34m 22s
pytest-docker-py310-icx-omp-base	30m 9s
pytest-ubuntu-py313-gcc14-omp-adjoint	30m 56s
	12h 0m 16s

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