Make the retry throttle optional #1245

Job	Run time
License Header and Formatting Checks	6m 38s
Integration Tests on swiftlang/swift:nightly-jammy	3m 30s
Build and Test on swiftlang/swift:nightly-jammy	4m 29s
Integration Tests on swift:5.9-jammy	2m 45s
Performance Tests on swiftlang/swift:nightly-jammy	11m 44s
Build and Test on swift:5.9-jammy	3m 32s
Performance Tests on swift:5.9-jammy	10m 35s
Integration Tests on swift:5.8-focal	2m 26s
Build and Test on swift:5.8-focal	3m 25s
Performance Tests on swift:5.8-focal	9m 30s
Build and Test on swift:5.7-focal	3m 22s
Integration Tests on swift:5.7-focal	2m 19s
Performance Tests on swift:5.7-focal	9m 10s
	1h 13m 25s

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