Nodes: remove dead code that was used for node menus

Blender does not use this code anymore and a global search on Github
suggests that this was not used by anyone.

Pull Request: https://projects.blender.org/blender/blender/pulls/132019

scripts/startup/nodeitems_builtins.py

@@ -35,13 +35,6 @@ class ShaderNodeCategory(SortedNodeCategory):
                 context.space_data.tree_type == 'ShaderNodeTree')
 
 
-# Menu entry for node group tools.
-def group_tools_draw(_self, layout, _context):
-    layout.operator("node.group_make")
-    layout.operator("node.group_ungroup")
-    layout.separator()
-
-
 # Maps node tree type to group node type.
 node_tree_group_type = {
     'CompositorNodeTree': 'CompositorNodeGroup',
@@ -49,59 +42,3 @@ node_tree_group_type = {
     'TextureNodeTree': 'TextureNodeGroup',
     'GeometryNodeTree': 'GeometryNodeGroup',
 }
-
-
-# Generic node group items generator for shader, compositor, geometry and texture node groups.
-def node_group_items(context):
-    if context is None:
-        return
-    space = context.space_data
-    if not space:
-        return
-
-    yield NodeItemCustom(draw=group_tools_draw)
-
-    if group_input_output_item_poll(context):
-        yield NodeItem("NodeGroupInput")
-        yield NodeItem("NodeGroupOutput")
-
-    ntree = space.edit_tree
-    if not ntree:
-        return
-
-    yield NodeItemCustom(draw=lambda self, layout, context: layout.separator())
-
-    for group in context.blend_data.node_groups:
-        if group.bl_idname != ntree.bl_idname:
-            continue
-        # Filter out recursive groups.
-        if group.contains_tree(ntree):
-            continue
-        # Filter out hidden node-trees.
-        if group.name.startswith('.'):
-            continue
-        yield NodeItem(
-            node_tree_group_type[group.bl_idname],
-            label=group.name,
-            settings={"node_tree": "bpy.data.node_groups[{!r}]".format(group.name)},
-        )
-
-
-# only show input/output nodes inside node groups
-def group_input_output_item_poll(context):
-    space = context.space_data
-    if space.edit_tree in bpy.data.node_groups.values():
-        return True
-    return False
-
-
-def register():
-    pass
-
-
-def unregister():
-    pass
-
-
-if __name__ == "__main__":
-    register()