refactor: clean up verbose migration comments

Remove redundant Qt6 migration comments that restate obvious API changes:
- QtConcurrent::run parameter order explanations (preserved where lambda wrapping needed)
- QStringRef/QStringView API changes (shortened to essential info)
- QComboBox::activated signal signature change
- QMap::unite() removal semantics
- QAction include path change
- QMouseEvent/QWheelEvent position() API
- QList/QVector equivalence in Qt6
- QFuture continuation API
- Code generation comments

Preserved comments explaining non-obvious Qt6 behavior or necessary
API migration details.

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

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

@@ -487,8 +487,7 @@ void DataManager::onNotification(const QString &name, QSqlDriver::NotificationSo
   const QString triggerNameEx0 = triggerName(0);
   if (name.contains(triggerNameEx0))
   {
-    // Qt6: QStringRef removed; QString::mid returns a QString with the
-    // same substring semantics.
+    // Extract name after trigger prefix
     QString name_ = name.mid(triggerNameEx0.size() + 1);
     int exerciseId = name_.toInt();
     int participantId = payload.toInt();