action #137255
## Motivation Same as #127523 but for core squad. According to current plans s390-kvm-sle12 can not be provided anymore after 2023-10, see #132152 for context. ## Acceptance criteria * **AC1:** s390x kvm tests in the qe-core security scope use an openQA "machine definition" that uses the generic "s390-kvm" worker class ## Suggestions * Verify common openQA tests can work on "s390-kvm" worker class * Use "s390-kvm" in production job templates