Ignore Python 2 installations when querying for interpreters (#1905)

## Summary

Fixes https://github.com/astral-sh/uv/issues/1693

`uv` currently fails when a user has `python` 2 or older installed on
their system without a `python3` or `python3.exe` on their path because
the `get_interpreter_info.py` script fails executing (it uses some
Python 3+ APIs).

This PR fixes this by:

* Returning an explicit error code in `get_interpreter_info` if the
Python version isn't supported
* Skipping over this error in `python_query` if the user requested ANY
python version or a version >= 3.
* Error if the user requested a Python 2 version. 

## Test Plan

Error if the user requests a legacy python version. 

```
uv venv -p 2
  × Python 2 or older is not supported. Please use Python 3 or newer.
```


Ignore any python 2 installation when querying newer python
installations (using v4 here because I have python3 on the path and that
takes precedence over querying python)
```
 uv_interpreter::python_query::find_python selector=Major(4)
      0.005541s   0ms DEBUG uv_interpreter::interpreter Detecting markers for: /home/micha/.pyenv/shims/python
      0.059730s  54ms DEBUG uv_interpreter::python_query Found a Python 2 installation that isn't supported by uv, skipping.
      0.059983s  54ms DEBUG uv_interpreter::interpreter Using cached markers for: /usr/bin/python
  × No Python 4 In `PATH`. Is Python 4 installed?

```

crates/uv-interpreter/src/lib.rs

@@ -59,6 +59,8 @@ pub enum Error {
         stdout: String,
         stderr: String,
     },
+    #[error("Python 2 or older is not supported. Please use Python 3 or newer.")]
+    Python2OrOlder,
     #[error("Failed to write to cache")]
     Encode(#[from] rmp_serde::encode::Error),
     #[error("Broken virtualenv: Failed to parse pyvenv.cfg")]