Refactor AchievementsWindow::UpdateData to take a partial update parameter

UpdateData in AchievementsWindow now only updates the components being requested, massively improving the window's performance. The parameter is UpdatedItems in AchievementManager, which tracks which portions of the system have been updated for every update callback.

Source/Core/DolphinQt/MainWindow.cpp

@@ -2005,6 +2005,7 @@ void MainWindow::ShowAchievementsWindow()
   m_achievements_window->show();
   m_achievements_window->raise();
   m_achievements_window->activateWindow();
+  m_achievements_window->UpdateData(AchievementManager::UpdatedItems{.all = true});
 }
 
 void MainWindow::ShowAchievementSettings()