Partitioning: Finalise project_daily_statistics

Background

Related to: Table Cleanup: Partition project_daily_statisti... (&18879)

The project_daily_statistics table stores daily aggregated metrics for GitLab projects. Due to the rapidly increasing table size, we decided to partition this table to improve performance and manageability.

This is step 4 of the partitioning process. At this point, the backfill from step 3 should be completed.

To-Do

1. Verify backfill process from step 3 is complete
2. Stop the backfill process

resources:

1. Post-backfill cleanup (Release after a required stop post Step 2)