Obsolete a few unused things. (#18814)

src/Umbraco.Core/Actions/IAction.cs

@@ -37,6 +37,7 @@ public interface IAction : IDiscoverable
     /// <summary>
     ///     Gets the icon to display for this action
     /// </summary>
+    [Obsolete("No longer used. Scheduled for removal in V17.")]
     string Icon { get; }
 
     /// <summary>
@@ -51,5 +52,6 @@ public interface IAction : IDiscoverable
     /// <remarks>
     ///     Used in the UI when assigning permissions
     /// </remarks>
+    [Obsolete("No longer used. Scheduled for removal in V17.")]
     string? Category { get; }
 }

src/Umbraco.Core/Models/TemplateQuery/QueryResultModel.cs

@@ -1,5 +1,6 @@
 namespace Umbraco.Cms.Core.Models.TemplateQuery;
 
+[Obsolete("No longer used. Scheduled for removal in V17.")]
 public class QueryResultModel
 {
     public string? QueryExpression { get; set; }

src/Umbraco.Core/Models/TemplateQuery/TemplateQueryResult.cs

@@ -1,5 +1,6 @@
 namespace Umbraco.Cms.Core.Models.TemplateQuery;
 
+[Obsolete("No longer used. Scheduled for removal in V17.")]
 public class TemplateQueryResult
 {
     public string? Icon { get; set; }