Finalize lib/gitlab/background_migration/backfill_vulnerability_state_transitions_project_id

Gregory Havenga (is on PTO from 15 December 2025 to 02 January 2026)requested to merge
501629-resolve-incorrect-connection-usage-raised-in-spec-lib-gitlab-background_migration into master

What does this MR do and why?

This migration finalizes the backfill_vulnerability_state_transitions_project_id BBM ahead of the sec-decomposition so that we needn't deal with making it's execution account for the addition of the new Sec database connection.

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Related to #501629 (closed)

Edited by Gregory Havenga (is on PTO from 15 December 2025 to 02 January 2026)

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