Enforce MaxMagnitudeUnit clamp in GetMagnitudeUnit() #2167

Job	Run time
Lint	48s
ARM [GOAL install] [bullseye]	4m 6s
Win32	10m 2s
Win64	10m 18s
i386 Linux [GOAL install] [focal]	10m 18s
macOS 13 native [GOAL install] [GUI] [no depends]	10m 21s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	10m 17s
x86_64 Linux [GOAL install] [GUI] [noble] [no depends]	10m 19s
x86_64 Linux [ASan] [LSan] [UBSan] [integer] [jammy] [no depends]	10m 17s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	10m 18s
arm64 macOS 10.14 [GOAL deploy] [GUI] [no tests] [noble]	10m 18s
	1h 37m 22s

Provide feedback