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/TargetManagement/dds_handler.cpp

@@ -84,7 +84,7 @@ bool DdsHandler::init(const QStringList &qosFileList)
   {
     auto cb = [this](const ParticipantManagement::Participant & participant)
     {
-      if (participant.equipmentNumber.is_set())
+      if (participant.equipmentNumber.has_value())
       {
         m_partId2EquipNoMap.insert(participant.id, participant.equipmentNumber.get());
         m_equipNo2partIdMap.insert(participant.equipmentNumber.get(), participant.id);
@@ -127,8 +127,8 @@ void DdsHandler::onParticipantChanged(const ParticipantManagement::Participant &
     m_partId2EquipNoMap.remove(data.id);
   else
   {
-    m_partId2EquipNoMap[data.id] = data.equipmentNumber.is_set() ? data.equipmentNumber.get() : 0;
-    if (data.equipmentNumber.is_set())
+    m_partId2EquipNoMap[data.id] = data.equipmentNumber.has_value() ? data.equipmentNumber.get() : 0;
+    if (data.equipmentNumber.has_value())
       m_equipNo2partIdMap.insert(data.equipmentNumber.get(), data.id);
   }