Cleanup: Remove outliner edit mode context menu entries

The outliner context menu has options to enter and exit edit mode, but
they only show in edit mode, and they don't work. This removes the
broken entries and related code.

Part of T77408

Differential Revision: https://developer.blender.org/D8641

release/scripts/startup/bl_ui/space_outliner.py

@@ -275,7 +275,6 @@ class OUTLINER_MT_object(Menu):
 
         space = context.space_data
         obj = context.active_object
-        object_mode = 'OBJECT' if obj is None else obj.mode
 
         layout.operator("outliner.id_copy", text="Copy", icon='COPYDOWN')
         layout.operator("outliner.id_paste", text="Paste", icon='PASTEDOWN')
@@ -293,16 +292,6 @@ class OUTLINER_MT_object(Menu):
 
         layout.separator()
 
-        if object_mode in {'EDIT', 'POSE'}:
-            name = bpy.types.Object.bl_rna.properties["mode"].enum_items[object_mode].name
-            layout.operator("outliner.object_operation",
-                            text=iface_("%s Set", i18n_contexts.operator_default) % name).type = 'OBJECT_MODE_ENTER'
-            layout.operator("outliner.object_operation",
-                            text=iface_("%s Clear", i18n_contexts.operator_default) % name).type = 'OBJECT_MODE_EXIT'
-            del name
-
-            layout.separator()
-
         if not (space.display_mode == 'VIEW_LAYER' and not space.use_filter_collection):
             layout.operator("outliner.id_operation", text="Unlink").type = 'UNLINK'
             layout.separator()