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/DDS/Core/pacemaker.cpp

@@ -59,7 +59,7 @@ void Pacemaker::addPort(unsigned short number, Core::CorePortType portType, cons
 
 void Pacemaker::addPortInternal(unsigned short number, Core::CorePortType portType, const QString& properties)
 {
-    if (!m_state.ports.is_set())
+    if (!m_state.ports.has_value())
         m_state.ports = std::vector<Core::PortInformation>();
     m_state.ports.get().push_back(Core::PortInformation(number, portType, properties.toStdString()));