[Trig]RoiDescriptor: remove roiId/Word and l1Id interface from RoiDescriptor

Frank Winklmeierrequested to merge
fwinkl/athena:roidescr_cleanup into 23.0

Remove the legacy Roi and L1 interfaces from the RoiDescriptor class as these are only supported by TrigRoiDescriptor. Also remove unused m_serialized member and consistently use virtual...override to make it clear which methods are inherited.

cc @sutt

Merge request reports