Removing duplicated lines - wip

MainProject/Core/Attributes/ValidateModelStateAutomaticallyAttribute.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace BasicDotnetTemplate.MainProject.Core.Attributes
+{
+    /// <summary>
+    /// Indicates that ModelState validation is handled automatically by an Action Filter.
+    /// Used to suppress SonarCloud warnings about missing ModelState.IsValid checks.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
+    public class ModelStateValidationHandledByFilterAttribute : Attribute
+    { }
+}