HDDS-11057. Enable reproducible builds

[adoroszlai]

What changes were proposed in this pull request?

• Enable reproducible builds by setting the project.build.outputTimestamp property.
• Remove build user and date/time, which make builds non-reproducible.
• Add new check repro to verify jars created by build check.

(This is only the first step in making all Ozone build artifacts reproducible.)

https://issues.apache.org/jira/browse/HDDS-11057

How was this patch tested?

https://github.com/adoroszlai/ozone/actions/runs/9634357696

[kerneltime]

I am not sure which is the source artifacts used to validate reproducible builds.

[adoroszlai]

which is the source artifacts used to validate reproducible builds

The jars created and uploaded by build check.

[adoroszlai]

Build user and time is accessed in

ozone/hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/utils/VersionInfo.java

Lines 72 to 78 in 7df3120

	public String getDate() {
	return info.getProperty("date", "Unknown");
	}
	public String getUser() {
	return info.getProperty("user", "Unknown");
	}

and reported in ozone version output:

ozone/hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/util/OzoneVersionInfo.java

Lines 72 to 73 in 7df3120

	System.out.println("Compiled by " + OZONE_VERSION_INFO.getUser() + " on "
	+ OZONE_VERSION_INFO.getDate());

I plan to remove that, too, but the method which creates the version output string is being refactored in #6876.