Include pre-release Python versions in `uv python list` (#7290)
Follows https://github.com/astral-sh/uv/pull/7278
Closes https://github.com/astral-sh/uv/issues/7280
`uv python list` should show installed pre-release versions, even though
we don't select them by default (as defined by #7300 and
https://github.com/astral-sh/uv/pull/7278)
