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/AudioVideoManagement/avs_menus.cpp

@@ -263,7 +263,7 @@ void AvsMenus::Menu::replaceMvsEntries(MenuStruct &menu) const
   newMenu.reserve(menu.menuEntries.size());
   for (auto menuEntry : menu.menuEntries)
   {
-    if (menuEntry.mountingPointId.is_set() && menuEntry.mountingPointId.get() < 0)
+    if (menuEntry.mountingPointId.has_value() && menuEntry.mountingPointId.get() < 0)
       menuEntry.name = m_dtc->videoTeam(menuEntry.mountingPointId.get()*-1).streamName;
     newMenu.push_back(std::move(menuEntry));
   }
@@ -360,12 +360,12 @@ void AvsMenus::Menu::setMenu(const MenuStruct &menu, const boost::optional<int>
   std::vector<AudioVideoManagement::AvMenuEntry> menuEntriesToUse;
   for (const auto &entry : realMenu.menuEntries())
   {
-    if (!entry.isGroup() && !entry.mountingPointId.is_set()  )
+    if (!entry.isGroup() && !entry.mountingPointId.has_value()  )
       continue;
 
     bool isMounted = false;
 
-    if(!entry.isGroup() && entry.mountingPointId.is_set())
+    if(!entry.isGroup() && entry.mountingPointId.has_value())
     {
 
       for (const auto &mountedAsset : mountedAssets)