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/Common/LtsSession/lts_session.cpp

@@ -916,6 +916,11 @@ void LtsSession::setExerciseData(const LtsWidgets::ExerciseData& exerciseData)
     emit signalExerciseDataChanged();
 }
 
+const LtsWidgets::ExerciseData* LtsSession::exerciseData() const
+{
+    return m_exerciseData;
+}
+
 void LtsSession::setProfilePicture(const QPixmap& pixmap)
 {
     // partitionType(); ?!?