Ensure fetcher authorization delays support stop callbacks. #407

Job	Run time
pod-lib-lint (ios, Debug)	8m 54s
pod-lib-lint (ios, Release)	10m 7s
pod-lib-lint (macos, Debug)	8m 37s
pod-lib-lint (macos, Release)	7m 56s
pod-lib-lint (tvos, Debug)	9m 13s
pod-lib-lint (tvos, Release)	8m 20s
pod-lib-lint (visionos, Debug)	9m 19s
pod-lib-lint (visionos, Release)	19m 44s
pod-lib-lint (watchos --skip-tests, Debug)	5m 44s
pod-lib-lint (watchos --skip-tests, Release)	1m 34s
	1h 29m 28s

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