Enforce MaxMagnitudeUnit clamp in GetMagnitudeUnit() #2154

Job	Run time
Lint	45s
ARM [GOAL install] [bullseye]	4m 18s
Win32	5m 8s
macOS 13 native [GOAL install] [GUI] [no depends]	5m 32s
Win64	14m 48s
i386 Linux [GOAL install] [focal]	3m 58s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	14m 30s
x86_64 Linux [GOAL install] [GUI] [noble] [no depends]	14m 21s
x86_64 Linux [ASan] [LSan] [UBSan] [integer] [jammy] [no depends]	14m 38s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	15m 21s
arm64 macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	15m 48s
	1h 49m 7s

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