Ignore Python 2 installations when querying for interpreters

[MichaReiser]

Summary

Fixes #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?