OnlineQueue: snapshot creation logs should be DEBUG not INFO

queue.py:172 uses logging.info for the `"Creating snapshot for key..."` messages and fire on every validation epoch.  Over the course of O(100) epochs this pollutes the log a bit. Should they be logging.debug isntead?

<img width="1918" height="396" alt="Image" src="https://github.com/user-attachments/assets/8bf17d94-de15-4d76-adf2-858abf5f1827" />