[FIX JENKINS-39268] Properties are not passed to Maven command by Maven build step (#2638)

* [FIX JENKINS-39268] Properties are not passed to Maven command by Maven build step

* [FIX JENKINS-39268] Properties are not passed to Maven command by Maven build step

* [FIX JENKINS-39268] Properties are not passed to Maven command by Maven build step

* [FIX JENKINS-39268] Changed order in which properties are appended to command line: properties appended later win in case of conflicts

* [FIX JENKINS-39268] More precise messages in some assertions

* [FIX JENKINS-39268] Cleanup unused imports

* [FIX JENKINS-39268] Added functional tests for Maven task.

(cherry picked from commit 138ce3d8)