Resolve vulnerability cross interaction issues in spec/support/shared_examples/lib/gitlab/background_migration/backfill_desired_sharding_key_shared_examples.rb

Gregory Havenga (is on PTO from 15 December 2025 to 02 January 2026)requested to merge
480354-resolve-vulnerability-cross-interaction-issues-in-spec-support-shared_examples-lib-gitlab into master

What does this MR do and why?

This MR removes some transitional cross join suppressions that are no longer applicable in this later stage of the sec-decomposition effort.

This change has no functional impact on GitLab.

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Related to #480354 (closed)

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