Removes migration stub headers superseded by codegen outputs

Drops 184 stub headers and obsolete stub tests now generated in the build tree.

qt6-after/qt6-migrated-legatus/tests/test_scm_dtc.cpp

@@ -1,16 +0,0 @@
-/**
- * @file test_scm_dtc.cpp
- * @brief Compilation test for include/ScenarioManagement/scm_dtc.h
- *
- * This test verifies that the migrated header compiles correctly with Qt6/C++23.
- */
-
-#include "include/ScenarioManagement/scm_dtc.h"
-
-#include <gtest/gtest.h>
-
-TEST(scm_dtc_Compilation, HeaderCompiles)
-{
-    // This test verifies that the header compiles without errors
-    EXPECT_TRUE(true);
-}