Fix cross-join between vulnerability_occurrences and security_findings

Problem to solve

All cross-joins arising from decomposing gitlab_sec from gitlab_main should be resolved. See parent epic for context.

1. Remove allowed cross-join for relevant relation using associated documentation for guidance on removing cross-joins or cross-transactions occurrences

Files

• ee/lib/ee/gitlab/background_migration/migrate_vulnerabilities_feedback_to_vulnerabilities_state_transition.rb