Provide pyproject.toml path for parse errors in uv venv

[charliermarsh]

Summary

Closes #10522.

Test Plan

❯ cargo run venv
warning: Failed to parse `pyproject.toml` during environment creation:
  TOML parse error at line 1, column 1
    |
  1 | [project]
    | ^^^^^^^^^
  `pyproject.toml` is using the `[project]` table, but the required `project.version` field is neither set nor present in the `project.dynamic` list

Using CPython 3.13.0
Creating virtual environment at: .venv
Activate with: source .venv/bin/activate

[charliermarsh]

This matches the general style and structure of the comparable error we show in settings discovery:

uv/crates/uv-settings/src/lib.rs

Line 82 in b38d3fe

"Failed to parse `{}` during settings discovery:\n{}",