Finalize migration BackfillPackagesComposerPackagesTable

What does this MR do and why?

This MR finalized the migration BackfillPackagesComposerPackagesTable.

The background migration BackfillPackagesComposerPackagesTable was completed on gitlab.com

/chatops run batched_background_migrations status 2000982 --database main

and included in the 18.2 required stop

References

Finalize background migration to backfill packa... (#548760 - closed)

Screenshots or screen recordings

No.

How to set up and validate locally

$ rails db:migrate

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #548760 (closed)