Keep file permissions when extracting zip archives on Unix (#31304)

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

crates/languages/src/rust.rs

@@ -216,7 +216,7 @@ impl LspAdapter for RustLspAdapter {
                         })?;
                 }
                 AssetKind::Zip => {
-                    extract_zip(&destination_path, BufReader::new(response.body_mut()))
+                    extract_zip(&destination_path, response.body_mut())
                         .await
                         .with_context(|| {
                             format!("unzipping {} to {:?}", version.url, destination_path)