Utilise `PetscSection` to constrain essential boundary conditions #9167

Job	Run time
pytest-ubuntu-py310-gcc14-omp-adjoint	30m 2s
pytest-ubuntu-py311-gcc10-noomp-base	39m 44s
pytest-ubuntu-py310-gcc14-omp-base	43m 22s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	27m 55s
pytest-ubuntu-py310-gcc9-omp-base	39m 9s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	44m 56s
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	37m 34s
pytest-docker-py310-gcc-omp-adjoint	26m 10s
pytest-ubuntu-py312-gcc12-cxxomp-base	55m 29s
pytest-ubuntu-py313-gcc14-omp-base	48m 20s
pytest-docker-py310-icx-omp-adjoint	27m 21s
pytest-docker-py310-icx-omp-base	31m 27s
pytest-docker-py310-gcc-omp-base	36m 21s
pytest-ubuntu-py312-gcc13-omp-adjoint	33m 44s
pytest-docker-py310-gcc-omp-arm64-adjoint	23m 42s
pytest-ubuntu-py311-gcc10-noomp-adjoint	28m 2s
pytest-ubuntu-py313-gcc14-omp-adjoint	34m 20s
pytest-ubuntu-py310-gcc9-omp-adjoint	28m 5s
pytest-ubuntu-py312-gcc13-omp-base	50m 11s
pytest-docker-py310-gcc-omp-arm64-base	30m 12s
pytest-osx-py312-clang-omp-base	30m 42s
	12h 26m 48s

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