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/Evaluations/handler_comment.cpp

@@ -98,7 +98,7 @@ void HandlerComment::onEvlCommentModifyRequest(const rti::core::SampleIdentity &
   data.ts = QDateTime::fromMSecsSinceEpoch(request.ts);
   data.senderOperatorId = request.senderOperatorId;
 
-  if (request.receiverOperatorId.is_set())
+  if (request.receiverOperatorId.has_value())
     data.receiverOperatorId = request.receiverOperatorId.get();
 
   data.text = QString::fromStdString(request.text);