[Stable9] fix unit test on new jenkins setup and adjust Jenkinsfile (#25772) (#25775)

* Next step jenkinsfile (#25622)

* Adding timestamper and evaluation of test results even in case of failure

* Adding build timeout

* use fixed value 120 minutes as timeout for each test executing for now

* Terminate the build as soon as test execution fails

* Adjust external testing as well

* Finalize use of executeAndReport

* Fix discoverymanager tests (#25769)

* Allow testing of the DiscoveryManager

* Array sort order is of no relevance