Provide a way to terminate unfinished requests after graceful shutdown #11589

Job	Run time
site	8m 43s
lint	13m 18s
build-ubicloud-standard-8-jdk-21-snapshot-blockhound	24m 39s
build-macos-12-jdk-21	1h 6m 35s
build-windows-latest-jdk-21	1h 6m 45s
flaky-tests	14m 29s
build-ubicloud-standard-8-jdk-8	16m 22s
build-ubicloud-standard-8-jdk-11	17m 52s
build-ubicloud-standard-8-jdk-17-leak	6m 26s
build-ubicloud-standard-8-jdk-17-min-java-11	18m 50s
build-ubicloud-standard-8-jdk-17-min-java-17-coverage	24m 42s
	4h 38m 41s

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