Removal: docker-compose in Devstack

We have removed the dependency on the docker-compose PyPI package and replaced the old docker-compose calls in devstack with the new docker compose (no hyphen) since compose v1 is no longer supported. If you are on a Mac and using Docker Desktop, OrbStack, or Podman, this should Just Work ™. If you develop on Linux, follow the directions here to get the correct docker and docker compose versions.