Qt6 migration fixes: RTI DDS alias targets, ErrorMessage namespace, DDS header include path

qt6-after/qt6-migrated-legatus/Lts/Services/AssetManagement/ModuleTests/CMakeLists.txt

@@ -22,7 +22,7 @@ IF(BUILD_TESTING)
      RTI::nddscpp2
      svcAsmClient
      LtsCommandLineParser
-     ddsconnector
+     $<IF:$<TARGET_EXISTS:ddsconnector>,ddsconnector,>
      nglcoreapplication
    )
    IF(NOT BUILD_RPM)

qt6-after/qt6-migrated-legatus/Lts/Services/AssetManagement/ModuleTests/asm_tests.cpp

@@ -9,7 +9,7 @@
 
 #include <nglapplication/nglcoreapplication.h>
 #include <LtsCommandLineParser/LtsCommandLineParser.h>
-#include <QTimer>
+#include <QtCore/QTimer>
 #include <QTest>
 
 #include <AssetManagement/asm_ftc.h>

qt6-after/qt6-migrated-legatus/Lts/Services/AssetManagement/ModuleTests/asm_tests.h

@@ -12,7 +12,7 @@
 #include <AssetManagement/logger.h>
 
 #include <DDS/DDSConnector/dds_connector.h>
-#include <QObject>
+#include <QtCore/QObject>
 
 namespace AssetManagement
 {