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/Tools/EEMFakeServer/Server.cpp

@@ -20,7 +20,7 @@ Server::Server()
   : QObject(nullptr)
   , m_server(new QWebSocketServer(QString(), QWebSocketServer::NonSecureMode, this))
 {
-  QRandomGenerator::global()->seed();
+  // (legacy: qsrand(time(nullptr));) — Qt6's QRandomGenerator::global() is auto-seeded; ->seed() on the global aborts in Qt 6.10.
 }