Fix WP_MOK hardcoded to 8 bytes, use storage_size for portability #4530

Job	Run time
Lint Gate	1m 11s
Detect File Changes	11s
Github (macos, mpi, no-debug, false)	1h 14m 34s
Github (ubuntu, no-mpi, single, no-debug, false)	30m 38s
Github (ubuntu, mpi, debug, false)	3h 17m 50s
Oak Ridge \| Frontier (gpu-acc)	4h 9m 44s
Github (ubuntu, mpi, no-debug, true)	1h 34m 42s
Oak Ridge \| Frontier (gpu-omp)	1s
Georgia Tech \| Phoenix (gpu-omp)	10m 6s
Georgia Tech \| Phoenix (cpu)	1h 17m 6s
Github (macos, mpi, debug, false)	51m 40s
Github (ubuntu, mpi, no-debug, false)	2h 15m 42s
Georgia Tech \| Phoenix (gpu-acc)	4h 9m 44s
Github (ubuntu, mpi, debug, true)	1h 36m 37s
Oak Ridge \| Frontier (cpu)	1s
Oak Ridge \| Frontier (AMD) (gpu-omp)	1s
Oak Ridge \| Frontier (AMD) (cpu)	1s
	21h 9m 49s

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