Merge logical-module-structure into branch-rules.yml
Both of these files in repo-metadata define active branches for modules.
logical-module-structure is used by kdesrc-build together with the branch-group concept. It covers most projects, some of them via wildcards
branch-rules.yml is used by the Gitlab CI. It currently only covers things that other things depend on.
Given the large overlap, can we unify those to have a single source of branch information?