Clone individual files on windows ReFS (#3551)

Windows does not support cloning whole directories so clone each file
instead.

closes #3547 

## Test Plan

Ran ` uv pip install setuptools --link-mode=clone` manually

crates/install-wheel-rs/src/linker.rs

@@ -327,6 +327,15 @@ fn clone_recursive(
 
     debug!("Cloning {} to {}", from.display(), to.display());
 
+    if cfg!(windows) && from.is_dir() {
+        // On Windows, reflinking directories is not supported, so we copy each file instead.
+        fs::create_dir_all(&to)?;
+        for entry in fs::read_dir(from)? {
+            clone_recursive(site_packages, wheel, &entry?, attempt)?;
+        }
+        return Ok(());
+    }
+
     match attempt {
         Attempt::Initial => {
             if let Err(err) = reflink::reflink(&from, &to) {