Enforce MaxMagnitudeUnit clamp in GetMagnitudeUnit() #2202

Job	Run time
macOS 13 native [GOAL install] [GUI] [no depends]	17m 13s
ARM [GOAL install] [bullseye]	8m 31s
Win32	9m 38s
Lint	47s
Win64	13m 49s
i386 Linux [GOAL install] [focal]	8m 13s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	17m 7s
x86_64 Linux [GOAL install] [GUI] [noble] [no depends]	15m 14s
x86_64 Linux [ASan] [LSan] [UBSan] [integer] [jammy] [no depends]	16m 9s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	9m 55s
arm64 macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	10m 11s
	2h 6m 47s

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