Enforce MaxMagnitudeUnit clamp in GetMagnitudeUnit() #2179

Job	Run time
Lint	50s
ARM [GOAL install] [bullseye]	2m 40s
Win32	3m 7s
macOS 13 native [GOAL install] [GUI] [no depends]	10m 23s
Win64	4m 45s
i386 Linux [GOAL install] [focal]	2m 17s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	16m 9s
x86_64 Linux [GOAL install] [GUI] [noble] [no depends]	12m 37s
x86_64 Linux [ASan] [LSan] [UBSan] [integer] [jammy] [no depends]	5m 54s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	3m 41s
arm64 macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	3m 24s
	1h 5m 47s

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