Ensure fetcher authorization delays support stop callbacks. #338

Job	Run time
xcodebuild (ios, Debug)	7m 39s
swift (debug)	2m 50s
xcodebuild (ios, Release)	10m 53s
swift (release)	3m 5s
xcodebuild (macos, Debug)	3m 52s
xcodebuild (macos, Release)	3m 50s
xcodebuild (tvos, Debug)	4m 57s
xcodebuild (tvos, Release)	4m 49s
xcodebuild (visionos, Debug)	5m 10s
xcodebuild (visionos, Release)	4m 57s
xcodebuild (watchos, Debug)	2m 28s
xcodebuild (watchos, Release)	3m 6s
	57m 36s

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