Resolve cross join issues in gitlab/ee/app/services/vulnerabilities/create_service.rb

Gregory Havenga (is on PTO from 15 December 2025 to 02 January 2026)requested to merge
479586-resolve-cross-join-issues-in-gitlab-ee-app-services-vulnerabilities-create_service-rb into master

What does this MR do and why?

This MR removes a cross join suppression that was necessary early in the sec-decomposition process. It's removal with a green CI indicates no tests are flagging incorrect joins between tables that will be a problem post decomposition.

This change has no functional impact on GitLab.

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Related to #479586 (closed)

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

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