Merge feature/qt6-migration-basis-modules-services into feature/qt6-migration-basis-modules

Resolves 17 conflicts against legacy Qt5 semantics; validates with BUILD_RTI=ON BUILD_GRANTLEE=ON.

qt6-after/qt6-migrated-legatus/forward-declarations/Lts/Services/CentralEffectSimulation/ces_dtc.h

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

qt6-after/qt6-migrated-legatus/forward-declarations/Lts/Services/CentralEffectSimulation/ces_ftc.h

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