abort CI pipeline when deployed containers are unhealthy

Example: https://jenkins-oai.eurecom.fr/job/RAN-NSA-B200-Module-LTEBOX-Container/220/console

In this case, both the eNB and gNB containers are reported as unhealthy (unclear from the logs what went wrong). In this case, a test should be aborted and not be run until the end, wasting time.