Resolve cross table interaction issues in lib/gitlab/background_migration/backfill_has_merge_request_of_vulnerability_reads.rb
requested to merge 480545-resolve-cross-table-interaction-issues-in-lib-gitlab-background_migration into master
What does this MR do and why?
The BackfillHasMergeRequestOfVulnerabilityReads BBM was finalized in %17.0, which means it should be safe to remove now from the codebase ahead of the sec-decomposition in which it's spec can no longer pass due to cross join issues.
MR acceptance checklist
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Related to #480545 (closed)