Removes migration stub headers superseded by codegen outputs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/Lts/Services/AudioVideoManagement/avm_dtc.h

@@ -1,2 +0,0 @@
-#pragma once
-namespace AudioVideoManagement { namespace Interface { class Dtc; class Ftc; } }

qt6-after/qt6-migrated-legatus/Lts/Services/AudioVideoManagement/avm_ftc.h

@@ -1,2 +0,0 @@
-#pragma once
-namespace AudioVideoManagement { namespace Interface { class Dtc; class Ftc; } }

qt6-after/qt6-migrated-legatus/Lts/Services/AudioVideoManagement/svcavmcommon_export.h

@@ -1,14 +0,0 @@
-// Stub export header for non-RTI builds
-// When BUILD_RTI=OFF, svcAvmCommon library is not built
-// This stub allows dependent code to compile
-#ifndef SVCAVMCOMMON_EXPORT_H
-#define SVCAVMCOMMON_EXPORT_H
-
-// Map to the actual macro names used in the code
-#define SVCAVMCOMMON_EXPORT
-#define SVCAVMCOMMON_NO_EXPORT
-#define AVM_COMMON_EXPORT
-#define AVM_CLIENT_EXPORT
-#define AVM_SERVER_EXPORT
-
-#endif