Pass HttpContext to listener

Author: JamesNK

src/Grpc.AspNetCore.Server/Internal/HttpContextServerCallContext.cs

@@ -394,9 +394,9 @@ public void Initialize(ISystemClock? clock = null)
         private void RaiseHostActivityChanged()
         {
             // Notify diagnostic listener that activity has been changed
-            if (_diagnosticListener.IsEnabled() && _diagnosticListener.IsEnabled(GrpcServerConstants.HostActivityChanged))
+            if (_diagnosticListener.IsEnabled() && _diagnosticListener.IsEnabled(GrpcServerConstants.HostActivityChanged, HttpContext))
             {
-                _diagnosticListener.Write(GrpcServerConstants.HostActivityChanged, null);
+                _diagnosticListener.Write(GrpcServerConstants.HostActivityChanged, HttpContext);
             }
         }