Resolve cross join issues in ee/lib/ee/gitlab/background_migration/backfill_finding_initial_pipeline_id.rb

Gregory Havenga (is on PTO from 15 December 2025 to 02 January 2026)requested to merge
480364-resolve-cross-join-issues-in-ee-lib-ee-gitlab-background_migration into master

What does this MR do and why?

The named migration was finalized in %17.3 which was a required stop for GitLab. As such, it should be safe to remove this MR to avoid needing to resolve the cross join issue that won't function post sec-decomposition.

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Related to #480364 (closed)

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

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