Enable RUF, UP, G ruff lint, fix issues

examples/advection/surface.py

examples/advection/var-velocity.py

examples/advection/weak.py

grudge/array_context.py

grudge/discretization.py

grudge/dof_desc.py

grudge/geometry/__init__.py

grudge/models/advection.py

grudge/models/em.py

grudge/models/wave.py

grudge/op.py

grudge/projection.py

grudge/reductions.py

grudge/tools.py

grudge/trace_pair.py

pyproject.toml

setup.py

test/mesh_data.py

test/test_dt_utils.py

test/test_grudge.py