chore: move compaction progress notification up (to be more frequent) (#7389)

compactor2/src/driver.rs

@@ -287,9 +287,6 @@ async fn try_compact_partition(
             files_next.extend(created_files);
             files_next.extend(upgraded_files);
             files_next.extend(files_to_keep);
-        }
-
-        files = files_next;
 
             // Report to `timeout_with_progress_checking` that some progress has been made; stop
             // if sending this signal fails because something has gone terribly wrong for the other
@@ -298,6 +295,9 @@ async fn try_compact_partition(
                 return Err(Box::new(e));
             }
         }
+
+        files = files_next;
+    }
 }
 
 /// Compact or split given files