This should free up references to GPv2 types and operators and should
in turn make their removal easier.
- Remove keymaps for GPv2 operators from `blender_default.py` and
`industry_compatible_data.py`
- Remove keymap poll callback assignment from `gpencil_ops.cc`
- Remove keymap handler registration from `area.cc:ed_default_handlers`
Pull Request: https://projects.blender.org/blender/blender/pulls/128480
c986aa03b9