Prefer KVO for app storage observation (#3487) #6081

Job	Run time
Examples	16m 42s
Library (evolution)	3m 54s
Check Macro Compatibility	3m 39s
xcodebuild (15) (test, IOS, 15.4)	1h 6m 18s
xcodebuild (16) (IOS, 16.0)	7m 35s
xcodebuild (15) (test, MAC_CATALYST, 15.4)	37m 32s
xcodebuild (16) (MACOS, 16.0)	4m 32s
xcodebuild (15) (test, MACOS, 15.4)	13m 54s
xcodebuild (15) (test, TVOS, 15.4)	53m 45s
xcodebuild (15) (test, VISIONOS, 15.4)	3h 2m 42s
xcodebuild (15) (test, WATCHOS, 15.4)	46m 38s
xcodebuild (15) (IOS, 15.2)	8m 50s
xcodebuild (15) (MACOS, 15.2)	4m 53s
	7h 30m 54s

Provide feedback