test: skip symlink tests if create symlink failed (#1562)

- Added is_elevated crate to [target.'cfg(windows)'.dependencies]
- Required to check for admin privileges before running symlink tests

---------

Co-authored-by: Jo <10510431+j178@users.noreply.github.com>

crates/prek/src/hooks/pre_commit_hooks/check_symlinks.rs

@@ -91,7 +91,10 @@ mod tests {
         let link_path = dir.path().join("link.txt");
 
         // Windows requires different APIs for file vs directory symlinks
-        tokio::fs::symlink_file(&target, &link_path).await?;
+        if tokio::fs::symlink_file(&target, &link_path).await.is_err() {
+            // Skipping test: insufficient permissions for symlink creation on Windows
+            return Ok(());
+        }
 
         let (code, output) = check_file(Path::new(""), &link_path).await?;
         assert_eq!(code, 0);