Warn for builds in non-build and workspace root pyproject.toml (#11394)
When running `uv pip install .` in a directory with a pyproject.toml
that does not configure a build, we will invoke setuptools and get a
wheel we can't parse (https://github.com/astral-sh/uv/issues/11344).
This PR adds warnings around these setups.
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Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>