Backfill data into partitioned web_hook_logs (Step 2)

Problem

New data is being synced with a trigger, but not existing data.

Solution

• Enqueue migration to make sure existing data is in sync between both partitioned tables for self-managed

https://docs.gitlab.com/ee/development/database/partitioning/date_range.html#step-2-backfill-the-partitioned-copy-release-n