Improve env probes rendering if DDGI is enabled

Source/Engine/Graphics/RenderTask.h

@@ -228,6 +228,11 @@ public:
     /// </summary>
     bool IsCameraCut = true;
 
+    /// <summary>
+    /// True if the task is used for custom scene rendering and default scene drawing into output should be skipped. Enable it if you use Render event and draw scene manually.
+    /// </summary>
+    API_FIELD() bool IsCustomRendering = false;
+
     /// <summary>
     /// Marks the next rendered frame as camera cut. Used to clear the temporal effects history and prevent visual artifacts blended from the previous frames.
     /// </summary>