Preserve nested Kalbach-Mann metadata in HDF5 round-trip #8282

Job	Run time
filter-changes	8s
Python 3.12 (omp=n, mpi=n, dagmc=n, libmesh=n, event=n	18m 17s
Python 3.12 (omp=y, mpi=y, dagmc=n, libmesh=n, event=n	31m 6s
Python 3.13 (omp=n, mpi=n, dagmc=, libmesh=, event=	19m 37s
Python 3.14 (omp=n, mpi=n, dagmc=, libmesh=, event=	24m 6s
Python 3.12 (omp=y, mpi=n, dagmc=, libmesh=y, event=	35m 21s
Python 3.14t (omp=n, mpi=n, dagmc=, libmesh=, event=	23m 21s
Python 3.12 (omp=y, mpi=y, dagmc=, libmesh=y, event=	39m 10s
Python 3.12 (omp=y, mpi=y, dagmc=y, libmesh=, event=	47m 16s
Python 3.12 (omp=y, mpi=n, dagmc=n, libmesh=n, event=n	26m 31s
Python 3.12 (omp=n, mpi=y, dagmc=n, libmesh=n, event=n	25m 14s
Python 3.12 (omp=y, mpi=n, dagmc=, libmesh=, event=y	29m 49s
coverage	7s
Check CI status	3s
	5h 20m 6s

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