ref_int - Run itf tests as part of the EBcLfSA Integration

[opajonk]

Currently, the EBcLfSA Integration runs only a build of the showcases and integrates these into the pre-built image. It would be highly beneficial to run the itf integration tests as well, create test reports in the expected location.

[opajonk]

There is some example code to run ITF in the SOME/IP Gateway: eclipse-score/inc_someip_gateway#126