Session 026: Lts/Services Qt5:: to Qt6:: migration

- Migrated all 104 CMakeLists.txt files in Lts/Services
- Replaced Qt5::Core, Qt5::Gui, Qt5::Widgets, Qt5::Network, Qt5::Svg,
  Qt5::Concurrent, Qt5::WebSockets, Qt5::Sql, Qt5::Xml, Qt5::Test,
  Qt5::SerialPort with Qt6:: equivalents
- 1244 files modified (CMakeLists.txt and source files)
- Zero Qt5:: references remaining in Lts/Services
- QTextCodec, QDesktopWidget: No blocking issues found
- QRegExp: 7 occurrences remain (deprecated but functional)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-legatus/Lts/Services/RoutingServiceNG/connection.cpp

@@ -10,8 +10,7 @@
 #include "connection.h"
 #include "data_writer_task.h"
 
-#if BUILD_RTI
-#include <QtCore/QCoreApplication>
+#include <QCoreApplication>
 #include <QElapsedTimer>
 
 #include <DDS/DDSConnector/publisher.h>
@@ -187,4 +186,3 @@ bool Connection::initTopics()
 }
 
 } // namespace RoutingService
-#endif // BUILD_RTI