uv settings are ignored in pyproject.toml

[aignas]

@aaronsky from Slack:

Another thing I noticed: it seems as though [tool.uv] settings in my pyproject.toml aren’t being considered when using the lock rule, so I have to duplicate settings as flags into args. This works as-expected in rules_uv’s pip_compile rule, despite the fact that neither it nor rules_python’s implementation pass --project/--config-file, nor set UV_PROJECT/UV_CONFIG_FILE in the environment. So I’m not sure what’s going on there.