Migrates residual Lts sources to generated rtiddsgen API

Adds NmeaManagement tests, fixes codegen includes and Qt6 SerialPort CMake target.

qt6-after/qt6-migrated-legatus/Lts/Services/WarehouseGuez/WsBaseDataInterface/data_manager.cpp

@@ -486,8 +486,9 @@ void DataManager::onNotification(const QString &name, QSqlDriver::NotificationSo
   const QString triggerNameEx0 = triggerName(0);
   if (name.contains(triggerNameEx0))
   {
-    QStringRef name_(&name);
-    name_ = name_.mid(triggerNameEx0.size() + 1);
+    // Qt6: QStringRef removed; QString::mid returns a QString with the
+    // same substring semantics.
+    QString name_ = name.mid(triggerNameEx0.size() + 1);
     int exerciseId = name_.toInt();
     int participantId = payload.toInt();
     INFO_LOG(m_logger) << "exerciseId: " << exerciseId << ", participantId: " << participantId;