Complete Qt6 migration: full clean build green across groups G1-G12 incl. runtime plugin set

new_docker_build.sh gains Group 12 (212 GUI/Data plugins); fixes LtsUtilsGuiDds visibility (LTO-stripped exports), LtsProjectionWorkstation unity name shadow, 6 unity-off dirs (dup file-scope statics, ddsftc INTERFACE sources) and reconfigures BUILD_FILTERMANAGEMENT/BUILD_PLUGINS_SERVICEMONITOR=ON

qt6-after/qt6-migrated-legatus/Lts/Services/AreaEffectSimulation/aes_dtc_impl_custom.cpp

@@ -252,7 +252,7 @@ int DtcImplCustom::partyForDusMine(int dusMineId) const
         auto it =  m_mineAreaCont.find(dms.id);
         if (it == m_mineAreaCont.end())
           return 1;
-        return it.value().partyId.is_set() ? it.value().partyId.get() : 1;
+        return it.value().partyId.has_value() ? it.value().partyId.get() : 1;
       }
     }
   }