Core/AreaTriggers: Replace fixed movement times in database for areatriggers with speed

Port From (https://github.com/TrinityCore/TrinityCore/commit/069771e22ef29e47298c62e6cb9d7dce72375348)

Source/Game/Entities/AreaTrigger/AreaTriggerTemplate.cs

@@ -266,13 +266,14 @@ namespace Game.Entities
 
         public uint? SpellForVisuals;
 
-        public uint TimeToTarget;
         public uint TimeToTargetScale;
 
         public AreaTriggerScaleCurveTemplate OverrideScale;
         public AreaTriggerScaleCurveTemplate ExtraScale;
 
         public AreaTriggerShapeInfo Shape = new();
+
+        public float Speed = 1.0f;
         public List<Vector3> SplinePoints = new();
         public AreaTriggerOrbitInfo OrbitInfo;