Improve uvx error message when uv is missing (#9745)
from https://github.com/astral-sh/uv/issues/9742
```
❯ cargo run -q --bin uvx
Provide a command to run with `uvx <command>`.
The following tools are installed:
- ansible-core v2.17.5
- black v24.10.0
- rooster-blue v0.0.0
See `uvx --help` for more information.
❯ rm target/debug/uv
❯ cargo run -q --bin uvx
error: Could not find the `uv` binary at /Users/zb/workspace/uv/target/debug/uv
```
