Context

The build pipeline has an extra stage for executing the Zeebe integration tests. Currently this stage requires the Camunda BPM Engine. Furthermore, AbstractZeebeIT still inherits the engine extensions.  

Steps to reproduce:

1. Start a build pipeline (e.g. push something in a Github PR)

Actual result :

The test stage "IT Zeebe" requires CamBPM

Expected result:

IT Zeebe stage should still work when this commented is removed from the Jenkinsfile (camBpmContainerSpec(camBpmVersion, false, 6, 4). AbstractZeebeIT still inherits the engine extensions, we should separate these having a real AbstractIT without cambpm or zeebe specifics but just optimize and elasticsearch extensions as well as AbstractCamundaPlatformIT & AbstractZeebeIT