Fix WP_MOK hardcoded to 8 bytes, use storage_size for portability #4636

Job	Run time
Lint Gate	1m 19s
Detect File Changes	11s
Github (ubuntu, no-mpi, single, no-debug, false)	27m 40s
Github (ubuntu, mpi, no-debug, false)	28m 6s
Github (macos, mpi, no-debug, false)	1s
Github (macos, mpi, debug, false)	1s
Github (ubuntu, mpi, debug, true)	27m 39s
Oak Ridge \| Frontier (AMD) (gpu-omp)	1s
Github (ubuntu, mpi, debug, false)	26m 9s
Oak Ridge \| Frontier (AMD) (cpu)	1s
Github (ubuntu, mpi, no-debug, true)	25m 35s
Oak Ridge \| Frontier (gpu-acc)	31m 31s
Georgia Tech \| Phoenix (cpu)	31m 31s
Georgia Tech \| Phoenix (gpu-acc)	1s
Oak Ridge \| Frontier (gpu-omp)	1s
Oak Ridge \| Frontier (cpu)	1s
Georgia Tech \| Phoenix (gpu-omp)	1s
	3h 19m 49s

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