fix udi leaking in the management api (#15684)

* [WIP] Stop Udi leaking on ConterPicker

* Refined Udi conversion for contentPicker

Cleaned up base construcor usage to move away from the obsoleted one.

* Fixed Udi lieaking in MNTP

* Stopped Udi bleeding for MultiUrlPicker

* Remove unused assignment

* Resolved namespace issue

* Use correct configuration value for MNTP udi parsing

* Turn helper auto props into local helper function to avoid unnecesary serialization

* Remove Newtonsoft.Json from Multi URL picker

* Fixed MNTP configuration serialization

* Changed MNTP editor data from csv guid to EditorEntityReference[]

* Added remarks for the MNTP editor conversion logic

* Reworked MNTPPropertyEditor Unittests

changed intent of one
fixed bug because of 1 rework

* Update OpenApi.json

---------

Co-authored-by: Sven Geusens <sge@umbraco.dk>
Co-authored-by: Elitsa <elm@umbraco.dk>
Co-authored-by: kjac <kja@umbraco.dk>

src/Umbraco.Core/Models/ContentEditing/LinkDisplay.cs

@@ -23,9 +23,19 @@ public class LinkDisplay
     [DataMember(Name = "trashed")]
     public bool Trashed { get; set; }
 
-    [DataMember(Name = "udi")]
-    public GuidUdi? Udi { get; set; }
+    [DataMember(Name = "type")]
+    public string? Type { get; set; }
+
+    [DataMember(Name = "unique")]
+    public Guid? Unique { get; set; }
 
     [DataMember(Name = "url")]
     public string? Url { get; set; }
+
+    public static class Types
+    {
+        public const string Document = "document";
+        public const string Media = "media";
+        public const string External = "external";
+    }
 }