Add missing find_package to private dependencies

this has no visible effect in the nightlies but fixes the super project build.

added Build cleanup lhcb-gaudi-head labels

assigned to @rmatev

• [2022-03-24 00:09] Validation started with lhcb-gaudi-head#3196

this is tested and ready

assigned to @erodrigu and @pkoppenb and unassigned @rmatev

approved this merge request

approved this merge request

merged

mentioned in commit 606845e6