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Bojan Marjanovic authored
## What does this MR do and why? Add and backfill project_id for packages_dependency_links. This table has a [desired sharding key](https://docs.gitlab.com/ee/development/database/multiple_databases.html#define-a-desired_sharding_key-to-automatically-backfill-a-sharding_key) configured ([view configuration](https://gitlab.com/gitlab-org/gitlab/-/blob/master/db/docs/packages_dependency_links.yml)). This merge request is the first step towards transforming the desired sharding key into a [sharding key](https://docs.gitlab.com/ee/development/database/multiple_databases.html#defining-a-sharding-key-for-all-cell-local-tables). This involves three changes: - Adding a new column that will serve as the sharding key (along with the relevant index and foreign key). - Populating the sharding key when new records are created by adding a database function and trigger. - Scheduling a [batched background migration](https://docs.gitlab.com/ee/development/data...