Ensure fetcher authorization delays support stop callbacks. #368

Job	Run time
swift (debug)	2m 57s
xcodebuild (ios, Debug)	7m 43s
swift (release)	2m 55s
xcodebuild (ios, Release)	11m 20s
xcodebuild (macos, Debug)	3m 17s
xcodebuild (macos, Release)	3m 48s
xcodebuild (tvos, Debug)	7m 17s
xcodebuild (tvos, Release)	6m 58s
xcodebuild (visionos, Debug)	5m 6s
xcodebuild (visionos, Release)	17m 37s
xcodebuild (watchos, Debug)	2m 1s
xcodebuild (watchos, Release)	1m 34s
	1h 12m 33s

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