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/AudioVideoManagement/object_menu_struct.h

@@ -47,7 +47,7 @@ public:
   /** Called as a result of a Remove-request. */
   Core::FunctionReplyObject remove();
 
-  long getId() const { return m_data.id(); }
+  long getId() const { return m_data.id; }
 
 private:
   void onPublishData();