This operator was duplicating feature that already exists in core
Blender (`node.join`), and was not working great as well. So there is
no need to maintain this python operator, but to keep consistency for
users I kept the keymap and UI entry but assigned it to `node.join`
operator instead, so that users don't notice change.
I assigned keymap inside add-on and not in Blender core because people
who didn't use Node Wrangler have that key free, or have something else
assigned (and `node.join` is already mapped to Ctrl+J), so only Node
Wrangler users should have this keymap. We can change it and rename
built-in operator to Parent, instead of Join, and remap it to Shift+P,
but that's separate discussion.
Resolves#129404.
Pull Request: https://projects.blender.org/blender/blender/pulls/132758