Limit autoscale mode to quarter and exact only #8946

Job	Run time
Event File	3s
Build (Linux) (21) / build	11m 32s
Build (macOS) (21, cocoa.macosx.x86_64, macos-15-intel) / build	23m 6s
Build (macOS) (21, cocoa.macosx.aarch64, macos-latest) / build	14m 9s
Build (Windows) (21) / build	15m 28s
	1h 4m 18s

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