Add timestamps to repro_compare.sh and friends #4059

Job	Run time
macOS (macOS, jdk11u, macos-14, temurin)	34m 51s
Linux (linux, jdk8u, temurin, adoptopenjdk/centos7_build_image)	12m 44s
macOS (macOS, jdk17u, macos-14, temurin)	29m 48s
Linux (linux, jdk11u, temurin, adoptopenjdk/centos7_build_image)	26m 9s
Windows (windows-2022, jdk11u, temurin)	57m 51s
Linux (linux, jdk17u, temurin, adoptopenjdk/centos7_build_image)	23m 22s
Windows (windows-2022, jdk17u, temurin)	59m 19s
Linux (linux, jdk, temurin, adoptopenjdk/centos7_build_image)	30m 3s
Windows (windows-2022, jdk, temurin)	1h 3m 13s
Linux (alpine-linux, jdk8u, temurin, adoptopenjdk/alpine3_build_image)	14m 58s
Linux (alpine-linux, jdk11u, temurin, adoptopenjdk/alpine3_build_image)	32m 9s
Linux (alpine-linux, jdk17u, temurin, adoptopenjdk/alpine3_build_image)	30m 35s
Linux (alpine-linux, jdk, temurin, adoptopenjdk/alpine3_build_image)	38m 40s
Linux (linux, jdk11u, dragonwell, adoptopenjdk/centos7_build_image)	26m 49s
Linux (linux, jdk11u, fast_startup, adoptopenjdk/centos7_build_image)	22m 53s
Linux (linux, jdk11u, bisheng, adoptopenjdk/centos7_build_image)	24m 29s
	8h 47m 53s

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