Revert "Merge branch 'sponce_ChannelIDs' into 'master'"

This reverts merge request !838 (merged) because it is breaking Gauss Sim10 as it depends on changes in LHCb HEAD and Detector HEAD.

Gauss Sim10 will branch off master AFTER moving to the new cmake

Will make a MR to reapply this later on.

cc: @sponce