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/ExerciseManagement/exercise_state_manager.cpp

@@ -74,7 +74,7 @@ namespace ExerciseManagement
         return tr("TERMINATED");
     }
 
-    return tr("Unknown State: (%1)").arg(state);
+    return tr("Unknown State: (%1)").arg(static_cast<int>(state));
   }
 
   void ExerciseStateManager::setStateInternal(ExerciseManagement::ExerciseState state)