Refactor DeleteResultProcedure to use MediatR handler

Remove ToObjectProcedure method and add DeleteResultProcedureHandler implementing IRequestHandler. The handler sends DeleteObjectProcedure via MediatR, mapping relevant properties. Also update using directives and namespace.

src/ReC.Application/Results/Commands/DeleteResultProcedure.cs

@@ -1,3 +1,4 @@
+using MediatR;
 using ReC.Application.Common.Procedures.DeleteProcedure;
 
 namespace ReC.Application.Results.Commands;
@@ -18,15 +19,18 @@ public record DeleteResultProcedure : IDeleteProcedure
     /// Force parameter (not used for RESULT entity as it has no dependencies)
     /// </summary>
     public bool Force { get; set; }
+}
 
-    public DeleteObjectProcedure ToObjectProcedure()
+public class DeleteResultProcedureHandler(ISender sender) : IRequestHandler<DeleteResultProcedure, int>
+{
+    public async Task<int> Handle(DeleteResultProcedure request, CancellationToken cancel)
     {
-        return new DeleteObjectProcedure
+        return await sender.Send(new DeleteObjectProcedure
         {
             Entity = "RESULT",
-            Start = Start,
-            End = End,
-            Force = Force
-        };
+            Start = request.Start,
+            End = request.End,
+            Force = request.Force
+        }, cancel);
     }
-}
+}