Removing build in favor of python-build

For nearly two years now, we have favored the use python-build as the package name for the PyPA build project over build. In fact, the build feedstock on conda-forge is archived and has not had its version updated. To complete this transition, we are going to mark all existing build packages as broken, provide a more detailed linter hint, and turn off the migration infrastructure we've been using to help move feedstocks. Any questions or comments can be directed to the GitHub issue on this work.