decrease the log level to debug because it is too noisy

pageserver/src/layered_repository.rs

@@ -1645,11 +1645,8 @@ impl LayeredTimeline {
                 };
 
                 let num_deltas = layers.count_deltas(&img_range, &(img_lsn..lsn))?;
-                if num_deltas == 0 {
-                    continue;
-                }
 
-                info!(
+                debug!(
                     "range {}-{}, has {} deltas on this timeline",
                     img_range.start, img_range.end, num_deltas
                 );