U4-10524 Show warning in UI for any picker that is referencing a trashed or deleted item

fixing the trash flag not getting mapped via automapper.
fixing up the ui for mediapicker.
fixing a small ui issue with the contentpicker and trashed content.

src/Umbraco.Web/Models/ContentEditing/EntityBasic.cs

@@ -2,10 +2,7 @@
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
-using System.Linq;
 using System.Runtime.Serialization;
-using System.Text;
-using System.Threading.Tasks;
 using Newtonsoft.Json;
 using Umbraco.Core;
 using Umbraco.Core.Models.Validation;