Add explicit @mainactor to NavigationLink initializer #6028

Job	Run time
Check Macro Compatibility	3m 10s
xcodebuild (test, IOS, 15.4)	14m 36s
Examples	24m 6s
xcodebuild (test, IOS, 16.0)	16m 14s
Library (evolution)	5m 9s
xcodebuild (test, MAC_CATALYST, 15.4)	15m 57s
xcodebuild (test, MACOS, 15.4)	5m 31s
xcodebuild (test, MACOS, 16.0)	4m 46s
xcodebuild (test, TVOS, 15.4)	1s
xcodebuild (test, VISIONOS, 15.4)	1s
xcodebuild (test, WATCHOS, 15.4)	1s
xcodebuild (IOS, 15.2)	1m 53s
xcodebuild (MACOS, 15.2)	1m 32s
	1h 32m 57s

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