fix(Core/Movement): add creature formation movement generator (#25030)

Co-authored-by: Shauren <shauren.trinity@gmail.com>
Co-authored-by: Rocco Silipo <108557877+Rorschach91@users.noreply.github.com>

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

@@ -44,6 +44,7 @@
 #include "MoveSpline.h"
 #include "MoveSplineInit.h"
 #include "MovementGenerator.h"
+#include "AbstractFollower.h"
 #include "ObjectAccessor.h"
 #include "ObjectMgr.h"
 #include "OutdoorPvP.h"
@@ -5528,6 +5529,16 @@ void Unit::RemoveAreaAurasDueToLeaveWorld()
     }
 }
 
+void Unit::RemoveAllFollowers()
+{
+    while (auto* ref = m_FollowingRefMgr.getFirst())
+    {
+        auto* source = ref->GetSource();
+        ref->delink();
+        source->SetTarget(nullptr);
+    }
+}
+
 void Unit::RemoveAllAuras()
 {
     // this may be a dead loop if some events on aura remove will continiously apply aura on remove
@@ -12700,6 +12711,8 @@ void Unit::RemoveFromWorld()
 
         RemoveAreaAurasDueToLeaveWorld();
 
+        RemoveAllFollowers();
+
         if (GetCharmerGUID())
         {
             LOG_FATAL("entities.unit", "Unit {} has charmer guid when removed from world", GetEntry());