complete backfill (#6512)

sql/moz-fx-data-shared-prod/telemetry_derived/newtab_visits_v1/backfill.yaml

@@ -4,7 +4,7 @@
   reason: Backfill dates where error in query caused Pocket clicks to be 0.
   watchers:
     - mbowerman@mozilla.com
-  status: Initiate
+  status: Complete
 
 2024-08-26:
   start_date: 2024-08-01