Try to fix online-offline yaml include conflict in installed version

Redmine: Refs #3577

This is a more complete extension of the "quick and dirty" approach I mentioned in the issue, which cures the problem reported there

=> The MR is intended to cross-check whether this has some unintended side-effects

Edit 20-21/03/2025:
=> The MR evolved into a more reduced and cleaner fix, while still addressing the problem only for this occurrence and not in a generic/general way
=> More permanent solution will be something closer to a set of enforce conventions for the full codebase

Of interest to: @a.bercuci @fweig @v.friese @s.zharko (maybe also @f.uhlig for the not fully required cmake include variables cleanup)