Core/AI: Make charmed creatures follow their owner (#24195)

* Core/AI: Make charmed creatures follow their owner

* Follow the charmer only when applying the charm

* Make SmartAI follow the charmer

(cherry picked from commit ddf2f60c1317f0ce728d5894064f51251cf71c72)

src/server/game/AI/SmartScripts/SmartAI.cpp

@@ -692,6 +692,9 @@ void SmartAI::OnCharmed(bool /*isNew*/)
 
     _charmed = charmed;
 
+    if (charmed)
+        me->GetMotionMaster()->MoveFollow(me->GetCharmer(), PET_FOLLOW_DIST, me->GetFollowAngle());
+
     if (!charmed && !me->IsInEvadeMode())
     {
         if (_repeatWaypointPath)