Lts/Services: finalize Qt6/C++17 migration cleanup

Remove deprecated Qt5 patterns remaining in Services:

- Replace remaining SIGNAL/SLOT string syntax with function pointer syntax
  (NmeaManagement/socket_handler.cpp, AudioVideoManagement/ModuleTests/mvs_tests.cpp)

- Remove Qt::UniqueConnection (deprecated in Qt6, default behavior) from
  19 files across AES, CES plugins, and cross-services (47 occurrences)

- Remove umbrella #include <QtCore> from fire_automaton.h and
  aes_test_fire_automaton.h (specific includes suffice)

25 files changed, 74 insertions(+), 81 deletions(-)

qt6-after/qt6-migrated-legatus/Lts/Services/Evaluations/ModuleTests/evl_tests.cpp

@@ -33,7 +33,7 @@ EvlTests::EvlTests(QObject *parent)
   qRegisterMetaType<Core::FunctionReply>("Core::FunctionReply");
 
   //  connect(m_dtc.get(), &Interface::Dtc::evaluationCriteriumChanged,
-  //          this,        &EvlTests::onReceiveCriteriumChanged, Qt::UniqueConnection);
+  //          this,        &EvlTests::onReceiveCriteriumChanged);
 
 } // end of ctor()