Enforce MaxMagnitudeUnit clamp in GetMagnitudeUnit() #2191

Job	Run time
Lint	47s
macOS 13 native [GOAL install] [GUI] [no depends]	19m 23s
ARM [GOAL install] [bullseye]	8m 11s
Win32	14m 19s
Win64	31m 55s
i386 Linux [GOAL install] [focal]	7m 45s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	17m 1s
x86_64 Linux [GOAL install] [GUI] [noble] [no depends]	14m 14s
x86_64 Linux [ASan] [LSan] [UBSan] [integer] [jammy] [no depends]	19m 49s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	27m 49s
arm64 macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	27m 36s
	3h 8m 49s

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