Minor refactor download dataset

src/leaderboard/build_leaderboard.py

@@ -27,6 +27,7 @@ def time_diff_wrapper(func):
 @time_diff_wrapper
 def download_dataset(repo_id, local_dir, repo_type="dataset", max_attempts=3, backoff_factor=1.5):
     """Download dataset with exponential backoff retries."""
+    os.makedirs(local_dir, exist_ok=True)
     attempt = 0
     while attempt < max_attempts:
         try:
@@ -51,9 +52,6 @@ def download_dataset(repo_id, local_dir, repo_type="dataset", max_attempts=3, ba
 
 
 def download_openbench():
-    """Downloads pre generated data"""
-    os.makedirs(DATA_ARENA_PATH, exist_ok=True)
-
     # download prev autogenerated leaderboard files
     download_dataset("Vikhrmodels/arena-leaderboard-metainfo", DATA_PATH)