Only use pyproject.toml for config when it already exists#934

nathanjmcdougall merged 17 commits intomainusethis-python/usethis-python:mainfrom

913-fallback-to-rufftoml-as-the-preferred-config-manager-for-ruff-if-pyprojecttoml-doesnt-existusethis-python/usethis-python:913-fallback-to-rufftoml-as-the-preferred-config-manager-for-ruff-if-pyprojecttoml-doesnt-existCopy head branch name to clipboard