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/InfrastructureManagement/schedule_status_manager.cpp

@@ -58,7 +58,7 @@ namespace InfrastructureManagement
 
   QString ScheduleStatusManager::toString(InfrastructureManagement::ScheduleStatus state)
   {
-    switch (state.underlying())
+    switch (state)
     {
       case ScheduleStatus::Unknown:
         return tr("UNKNOWN");
@@ -74,7 +74,7 @@ namespace InfrastructureManagement
         return tr("REMOVED");
     }
 
-    return tr("Unknown State: (%1)").arg(state.underlying());
+    return tr("Unknown State: (%1)").arg(state);
   }
 
   void ScheduleStatusManager::setStateInternal(InfrastructureManagement::ScheduleStatus state)