Update ReferenceType enum and clean up status handling

Modified the `ReferenceType` enum in `Constants.vb` to change the values for `Sender` and `Receiver`. Removed the `ReferenceType` and `StatusName` properties from `EnvelopeHistory.cs`. Updated status code comments in `HistoryController.cs`, adding new codes for `EnvelopeRejected` and `EnvelopeWithdrawn`, and adjusted parameter descriptions to align with the new enum values.

EnvelopeGenerator.Domain/Entities/EnvelopeHistory.cs

@@ -2,7 +2,6 @@
 using DigitalData.UserManager.Domain.Entities;
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
-using static EnvelopeGenerator.Common.Constants;
 
 namespace EnvelopeGenerator.Domain.Entities
 {
@@ -42,19 +41,5 @@ namespace EnvelopeGenerator.Domain.Entities
 
         [ForeignKey("UserReference")]
         public virtual Receiver? Receiver { get; set; }
-
-        [NotMapped]
-        public ReferenceType ReferenceType => (Status / 1000) switch
-        {
-            1 => ReferenceType.Sender,
-            2 or 3 => ReferenceType.Receiver,
-            _ => ReferenceType.Unknown,
-        };
-
-        [NotMapped]
-        public string? StatusName
-            => (Enum.IsDefined(typeof(EnvelopeStatus), Status)) 
-                ? Enum.GetName(typeof(EnvelopeStatus), Status) 
-                : null;            
     }
 }