Cycles: add per layer collection indirectly on setting.

In the outliner, right click > view layer > set indirect only. This is
like clearing camera ray visibility on objects in the collection, and is
temporary until we have more general dynamic overrides.

release/scripts/startup/bl_ui/space_outliner.py

@@ -146,6 +146,9 @@ class OUTLINER_MT_collection_view_layer(Menu):
         layout.operator("outliner.collection_exclude_clear")
 
         if context.engine == 'CYCLES':
+            layout.operator("outliner.collection_indirect_only_set")
+            layout.operator("outliner.collection_indirect_only_clear")
+
             layout.operator("outliner.collection_holdout_set")
             layout.operator("outliner.collection_holdout_clear")