Maven repository: missing org.kie:kie-test-util artifact

The Maven repository offline ZIP is missing org.kie:kie-test-util artifact. After brief investigation, it seems that the artifact is pulled in by optaplanner-persistence-jpa [1] added in RHDM-633.

Despite its name, the artifact scope is the default compile, not test. On master, the scope has already been amended to test, see [2]. I think we should backport the commit [2] to RHDM product branch (created RHDM-636 for that) and until the fix is done, include org.kie:kie-test-util into the Maven repository ZIPs.

[1] https://github.com/kiegroup/optaplanner/blob/7.5.x/optaplanner-persistence/optaplanner-persistence-jpa/pom.xml#L33
[2] https://github.com/kiegroup/optaplanner/commit/ff4d57b50e9755dcac949132336892ef0842a088