solution_ws - will need to be updated as well, but do the template_ws first. It's the one that's actually required. Don't bother maintaining a ROS1 version of all the files. I haven't checked anything off, you can compare the diff between your branch and the main repo's Foxy branch to see which files you have already touched, but which files are done I leave up to you. If you need a list for the solution_ws, I expect you can edit this issue (or make your own on your own fork) based on the example provided.