Add builder for Backoff #11936

Job	Run time
lint	12m 13s
site	8m 50s
flaky-tests	13m 51s
build-ubicloud-standard-16-jdk-21-snapshot-blockhound	25m 40s
build-macos-latest-jdk-21	31m 0s
build-windows-latest-jdk-21	1h 7m 21s
build-ubicloud-standard-16-jdk-8	15m 47s
build-ubicloud-standard-16-jdk-11	18m 18s
build-ubicloud-standard-16-jdk-17-leak	19m 42s
build-ubicloud-standard-16-jdk-17-min-java-11	13m 33s
build-ubicloud-standard-16-jdk-17-min-java-17-coverage	20m 42s
	4h 6m 57s

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