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/BuildingViewer/Common/bdv_controller.cpp

@@ -6,7 +6,7 @@
 #include "bdv_dds_controller.h"
 
 #include <Common/bdv_communication_interface_internal.h>
-#include <Common/bdv_plugin_provider.h>
+#include <BuildingViewer/Common/bdv_plugin_provider.h>
 #include <LtsAppManager/lts_app_manager.h>
 #include <LtsPluginManager/lts_plugin_manager.h>
 #include <LtsSession/lts_session.h>