Utilise `PetscSection` to constrain essential boundary conditions #9162

Job	Run time
pytest-ubuntu-py310-gcc9-omp-base	36m 25s
pytest-ubuntu-py310-gcc9-omp-adjoint	30m 32s
pytest-docker-py310-gcc-omp-base	30m 51s
pytest-ubuntu-py312-gcc12-cxxomp-base	36m 39s
pytest-osx-py312-clang-omp-base	36m 45s
pytest-ubuntu-py311-gcc10-noomp-base	33m 3s
pytest-docker-py310-icx-omp-adjoint	26m 45s
pytest-docker-py310-gcc-omp-arm64-adjoint	22m 30s
pytest-docker-py310-gcc-omp-adjoint	23m 29s
pytest-ubuntu-py310-gcc14-omp-base	35m 48s
pytest-ubuntu-py311-gcc10-noomp-adjoint	28m 27s
pytest-ubuntu-py312-gcc13-omp-base	36m 38s
pytest-ubuntu-py312-gcc13-omp-adjoint	31m 23s
pytest-ubuntu-py312-gcc12-cxxomp-adjoint	33m 17s
pytest-ubuntu-py311-gcc11-cxxnoomp-adjoint	31m 30s
pytest-ubuntu-py310-gcc14-omp-adjoint	30m 49s
pytest-docker-py310-gcc-omp-arm64-base	25m 12s
pytest-ubuntu-py313-gcc14-omp-adjoint	33m 21s
pytest-ubuntu-py311-gcc11-cxxnoomp-base	35m 53s
pytest-ubuntu-py313-gcc14-omp-base	36m 39s
pytest-docker-py310-icx-omp-base	24m 30s
	11h 0m 26s

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