Remove unnecessary logs from status aggreagtion

These can be inferred elsewhere:

- Task creation is obvious from task execution. If we're concerned
about a specific service, we can check the updated times on the DB
records, since all records are recreated each time this runs.

- Task starting is already logged.

- Task completion is already logged. The number of rows updated can
also be inferred from the DB.

The log I've found useful is the one about fetching the data, and
I've also added another to time how long it takes to insert the data,
as both could be sources of poor performance.

Arguably we should use metrics for this sort of thing, but logs are
easier in practice for the metric systems we have.

app/celery/reporting_tasks.py

@@ -106,19 +106,11 @@ def create_nightly_notification_status():
                     },
                     queue=QueueNames.REPORTING
                 )
-                current_app.logger.info(
-                    f"create-nightly-notification-status-for-day task created "
-                    f"for {service_id}, {notification_type} and {process_day}"
-                )
 
 
 @notify_celery.task(name="create-nightly-notification-status-for-service-and-day")
 def create_nightly_notification_status_for_service_and_day(process_day, service_id, notification_type):
     process_day = datetime.strptime(process_day, "%Y-%m-%d").date()
-    current_app.logger.info(
-        f'create-nightly-notification-status-for-day task started '
-        f'for {service_id}, {notification_type} for {process_day}'
-    )
 
     start = datetime.utcnow()
     new_status_rows = fetch_status_data_for_service_and_day(
@@ -134,6 +126,7 @@ def create_nightly_notification_status_for_service_and_day(process_day, service_
         f'data fetched in {(end - start).seconds} seconds'
     )
 
+    start = datetime.utcnow()
     update_fact_notification_status(
         new_status_rows=new_status_rows,
         process_day=process_day,
@@ -141,8 +134,9 @@ def create_nightly_notification_status_for_service_and_day(process_day, service_
         service_id=service_id
     )
 
+    end = datetime.utcnow()
     current_app.logger.info(
-        f'create-nightly-notification-status-for-day task finished '
+        f'create-nightly-notification-status-for-day task update '
         f'for {service_id}, {notification_type} for {process_day}: '
-        f'{len(new_status_rows)} rows updated'
+        f'data fetched in {(end - start).seconds} seconds'
     )