reduce verbosity of log

src/populate.py

@@ -70,7 +70,7 @@ def get_leaderboard_df(results_dataset_name: str) -> pd.DataFrame:
 
     full_df = pd.DataFrame(rows)
 
-    logger.info(f"Loaded results df: {full_df}")
+    logger.info(f"Loaded results df with {len(full_df)} entries")
 
     # TODO: Forbid multiple submissions under the same name?
     # Keep only the latest entry per unique (System Name, System Type, Organization) triplet