Finalize BackfillTerraformModulesMetadataWithSemver BBM

What does this MR do and why?

The BackfillTerraformModulesMetadataWithSemver BBM was enqueued in milestone 18.2, and its status is finished on gitlab.com.

As per docs, all conditions to finalize the BBM are met:

• The migration is completed on gitlab.com
• The migration was added in or before the last required stop. The last required stop is 18.2, and the BBM was added in it.

So, it should be safe to finalize the BBM.

References

• https://docs.gitlab.com/development/database/batched_background_migrations/#finalize-a-batched-background-migration
• Requeue `BackfillTerraformModulesMetadataWithSe... (!196527 - merged) • Moaz Khalifa • 18.2

Screenshots or screen recordings

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How to set up and validate locally

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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 #474746 (closed)