migrate: Qt5/C++11 app to Qt6/C++23 with tests and modern Qt APIs

Entire-Checkpoint: c1ee98dc34a3

build/CTestTestfile.cmake

@@ -0,0 +1,7 @@
+# CMake generated Testfile for 
+# Source directory: /workspace/qt6-after/qt6-migrated-benchmark
+# Build directory: /workspace/build
+# 
+# This file includes the relevant testing commands required for 
+# testing this directory and lists subdirectories to be tested as well.
+subdirs("tests")