[JENKINS-8651] Maven deployment with uniqueVersion == true creating "new" versions for attached artifacts

spinning the test annotations off to a library so that it can be used in other places, like in the core

so not delete/unzip anymore for all units but reuse already extracted one.
preserve io stuff :-)

use java.io.tmpdir to ${project.build.directory} when running tests : prevent issues on unix machine (solaris) and this shared /var/tmp