refactor(cmake): update test configuration for GUI targets

- Removed experimental test option and modular build option from CMakeLists.txt to simplify configuration.
- Added a definition for YAZE_GUI_TEST_TARGET in the test CMakeLists.txt to mark GUI test targets.
- Updated yaze_test.cc to conditionally register E2E tests only for GUI test targets, enhancing clarity in test registration.

Benefits:
- Streamlined CMake configuration for testing.
- Improved organization of test registration logic for GUI targets.

test/CMakeLists.txt

@@ -39,7 +39,8 @@ if(YAZE_BUILD_TESTS)
       target_link_libraries(${suite_name} PRIVATE ImGuiTestEngine)
       target_compile_definitions(${suite_name} PRIVATE 
         IMGUI_ENABLE_TEST_ENGINE=1 
-        IMGUI_TEST_ENGINE_ENABLE_COROUTINE_STDTHREAD_IMPL=1)
+        IMGUI_TEST_ENGINE_ENABLE_COROUTINE_STDTHREAD_IMPL=1
+        YAZE_GUI_TEST_TARGET=1)  # Mark this as a GUI test target
     endif()
 
     if(WIN32)

test/yaze_test.cc

@@ -311,19 +311,19 @@ int main(int argc, char* argv[]) {
     else if (config.test_speed == ImGuiTestRunSpeed_Cinematic) speed_name = "Cinematic";
     std::cout << "Running tests in " << speed_name << " mode" << std::endl;
     
-    // Register smoke test
+    // Register E2E tests only for GUI test targets (they have the source files)
+#ifdef YAZE_GUI_TEST_TARGET
     ImGuiTest* smoke_test = IM_REGISTER_TEST(engine, "E2ETest", "FrameworkSmokeTest");
     smoke_test->TestFunc = E2ETest_FrameworkSmokeTest;
 
-    // Register canvas selection test
     ImGuiTest* canvas_test = IM_REGISTER_TEST(engine, "E2ETest", "CanvasSelectionTest");
     canvas_test->TestFunc = E2ETest_CanvasSelectionTest;
     canvas_test->UserData = &controller;
     
-    // Register dungeon editor smoke test
     ImGuiTest* dungeon_test = IM_REGISTER_TEST(engine, "E2ETest", "DungeonEditorSmokeTest");
     dungeon_test->TestFunc = E2ETest_DungeonEditorV2SmokeTest;
     dungeon_test->UserData = &controller;
+#endif
 
     // Main loop
     bool done = false;