Fix mv read loop hardcoding 4 instead of nnode #4559

Job	Run time
Detect File Changes	10s
Lint Gate	1m 22s
Github (ubuntu, mpi, debug, true)	9m 3s
Github (ubuntu, mpi, no-debug, false)	10m 35s
Georgia Tech \| Phoenix (gpu-acc)	1m 52s
Github (ubuntu, mpi, debug, false)	8m 52s
Github (ubuntu, mpi, no-debug, true)	10m 37s
Georgia Tech \| Phoenix (cpu)	12m 46s
Github (macos, mpi, debug, false)	13m 7s
Oak Ridge \| Frontier (gpu-omp)	12m 46s
Oak Ridge \| Frontier (AMD) (gpu-omp)	1s
Oak Ridge \| Frontier (gpu-acc)	12m 46s
Github (ubuntu, no-mpi, single, no-debug, false)	9m 33s
Github (macos, mpi, no-debug, false)	12m 50s
Georgia Tech \| Phoenix (gpu-omp)	12m 46s
Oak Ridge \| Frontier (cpu)	1s
Oak Ridge \| Frontier (AMD) (cpu)	12m 46s
	2h 21m 53s

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