Follow-up of https://github.com/zed-industries/zed/pull/31080

Stop doing

```rs
#[cfg(not(windows))]
{
    file.set_permissions(<fs::Permissions as fs::unix::PermissionsExt>::from_mode(
        0o755,
    ))
    .await?;
}
```

after extracting zip archives on Unix, and use an API that provides the
file permissions data for each archive entry.

Release Notes:

- N/A