port updates of CI scripts to MT branch

This fixes some problems with the package and domain mapping. But
most importantly it updates the script for running unit tests such
that only unit tests for the affected packages are run. The previous
ctest command had two issues:
- multiple unit test labels were passed as parameters to ctest
  resulting in overwriting each other
- the label pattern was not strict enough so the unrelated unit tests
  were run in certain cases


Former-commit-id: 49254202