Convert ResourceUrlAnnotation.DisplayOrder from field to property

src/Aspire.Hosting/ApplicationModel/ResourceUrlAnnotation.cs

@@ -27,9 +27,9 @@ public sealed class ResourceUrlAnnotation : IResourceAnnotation
     public EndpointReference? Endpoint { get; init; }
 
     /// <summary>
-    /// The display order the URL. Higher values mean sort higher in the list.
+    /// The display order of the URL. Higher values mean sort higher in the list.
     /// </summary>
-    public int? DisplayOrder;
+    public int? DisplayOrder { get; set; }
 
     /// <summary>
     /// Locations where this URL should be shown on the dashboard. Defaults to <see cref="UrlDisplayLocation.SummaryAndDetails"/>.

src/Aspire.Hosting/api/Aspire.Hosting.cs

@@ -3157,7 +3157,7 @@ public ResourceStoppedEvent(IResource resource, System.IServiceProvider services
     [System.Diagnostics.DebuggerDisplay("Url = {Url}, DisplayText = {DisplayText}")]
     public sealed partial class ResourceUrlAnnotation : IResourceAnnotation
     {
-        public int? DisplayOrder;
+        public int? DisplayOrder { get { throw null; } set { } }
         public UrlDisplayLocation DisplayLocation { get { throw null; } set { } }
 
         public string? DisplayText { get { throw null; } set { } }