Set additive context disposed

Author: e-n-0

tracer/src/Datadog.Trace/AppSec/Coordinator/SecurityCoordinator.Core.cs

@@ -170,13 +170,19 @@ internal override int? StatusCode
         {
             get
             {
+                if (IsAdditiveContextDisposed())
+                {
+                    return null;
+                }
+
                 try
                 {
                     return Context.Response.StatusCode;
                 }
                 catch (Exception e) when (e is NullReferenceException or ObjectDisposedException)
                 {
                     Log.Debug(e, "Exception while trying to access StatusCode of a Context.Response.");
+                    SetAdditiveContextDisposed(true);
                     return null;
                 }
             }