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/Plugins/GuezIedManagement/gim_data_plugin_interface.h

@@ -4,10 +4,8 @@
 #pragma once
 
 #include <PluginInterfaces/data_plugin_interface.h>
-#ifdef BUILD_WITH_EXTERNAL_DDS
 #include <GuezIedManagement/gim_dtc.h>
 #include <GuezIedManagement/gim_ftc.h>
-#endif
 
 namespace GuezIedManagement
 {
@@ -18,10 +16,8 @@ class DataInterface : public DataPluginBase::Interface
 public:
   using DataPluginBase::Interface::Interface;
 
-#ifdef BUILD_WITH_EXTERNAL_DDS
   virtual std::shared_ptr<GuezIedManagement::Interface::Dtc> getDtc() = 0;
   virtual std::shared_ptr<GuezIedManagement::Interface::Ftc> getFtc() = 0;
-#endif
 };
 
 }