style: Apply clang-format to all C++ files

- Format MainWindow.cpp, MainWindow.h, main.cpp
- Format test files (test_main.cpp, test_mainwindow.cpp)
- Fixes Jenkins clang-format policy check

Entire-Checkpoint: ea47c089bf3a

qt6-after/qt6-migrated-benchmark/MainWindow.h

@@ -4,27 +4,30 @@
 #include <QRegularExpression>
 
 QT_BEGIN_NAMESPACE
-namespace Ui {
+
+namespace Ui
+{
 class MainWindow;
 }
+
 QT_END_NAMESPACE
 
 class MainWindow : public QMainWindow
 {
     Q_OBJECT
 
-public:
-    explicit MainWindow(QWidget *parent = nullptr);
+  public:
+    explicit MainWindow(QWidget* parent = nullptr);
     ~MainWindow();
 
-    [[nodiscard]] bool validateInput(const QString &text) const;
+    [[nodiscard]] bool validateInput(const QString& text) const;
     [[nodiscard]] QString getScreenInfo() const;
 
-public slots:
+  public slots:
     void onValidateClicked();
     void onScreenInfoClicked();
 
-private:
-    Ui::MainWindow *ui;
+  private:
+    Ui::MainWindow* ui;
     QRegularExpression m_pattern;
 };