"Downloader queue stats" is now provided once per minute (#21455)

* "Downloader queue stats" is now a DEBUG information

I think this info is more a DEBUG related information then an INFO. If it must remains an INFO, maybe it can be slow down to one time every 5 minutes or so.

* Update queue.go

"Downloader queue stats" information is now provided once every minute instead of once every 10 seconds.