fix(Core/Unit): Clear invalid combat refs after mind control (azerothcore#25424)

Co-authored-by: Lucas Nascimento <keader.android@gmail.com>

Author: Nyeriah

src/server/game/Entities/Unit/Unit.cpp

@@ -14878,6 +14878,9 @@ void Unit::RemoveCharmedBy(Unit* charmer)
 
     StopAttackingInvalidTarget();
 
+    // End stale combat refs between now-friendly units after faction restore
+    GetCombatManager().RevalidateCombat();
+
     Player* playerCharmer = charmer->ToPlayer();
     if (playerCharmer)
     {