Add timestamps to repro_compare.sh and friends #4066

Job	Run time
macOS (macOS, jdk11u, macos-14, temurin)	19s
Linux (linux, jdk8u, temurin, adoptopenjdk/centos7_build_image)	10s
Windows (windows-2022, jdk11u, temurin)	7s
macOS (macOS, jdk17u, macos-14, temurin)	19s
Linux (linux, jdk11u, temurin, adoptopenjdk/centos7_build_image)	10s
Windows (windows-2022, jdk17u, temurin)	7s
Linux (linux, jdk17u, temurin, adoptopenjdk/centos7_build_image)	10s
Windows (windows-2022, jdk, temurin)	7s
Linux (linux, jdk, temurin, adoptopenjdk/centos7_build_image)	11s
Linux (alpine-linux, jdk8u, temurin, adoptopenjdk/alpine3_build_image)	10s
Linux (alpine-linux, jdk11u, temurin, adoptopenjdk/alpine3_build_image)	10s
Linux (alpine-linux, jdk17u, temurin, adoptopenjdk/alpine3_build_image)	11s
Linux (alpine-linux, jdk, temurin, adoptopenjdk/alpine3_build_image)	11s
Linux (linux, jdk11u, dragonwell, adoptopenjdk/centos7_build_image)	9s
Linux (linux, jdk11u, fast_startup, adoptopenjdk/centos7_build_image)	10s
Linux (linux, jdk11u, bisheng, adoptopenjdk/centos7_build_image)	10s
	2m 51s

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