Update documentation and examples to use Swift Testing #5967

Job	Run time
Examples	5m 17s
xcodebuild (test, IOS, 15.4)	13m 15s
Library (evolution)	5m 16s
xcodebuild (test, IOS, 16.0)	12m 22s
xcodebuild (test, MAC_CATALYST, 15.4)	8m 14s
xcodebuild (test, MACOS, 15.4)	8m 14s
xcodebuild (test, MACOS, 16.0)	7m 56s
xcodebuild (test, TVOS, 15.4)	1s
xcodebuild (test, VISIONOS, 15.4)	1s
xcodebuild (test, WATCHOS, 15.4)	1s
xcodebuild (IOS, 15.2)	1m 7s
xcodebuild (MACOS, 15.2)	1m 19s
	1h 3m 3s

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