Only the assets/publish folder was moved in #137219, which broke the `make icons_geom` command for generating toolbar icons since the submodule is now gone. This patch moves the icons folder into a new `release/datafiles/icons_blend` folder and updates `blender_icons_geom_update.py` to fix the problem. Pull Request: https://projects.blender.org/blender/blender/pulls/142639