Resolve cross table interaction issues in ee/app/services/vulnerabilities/remediations/create_service.rb and spec
What does this MR do and why?
This MR removes some transition cross DB interaction suppressions that were necessary early in the sec-decomposition process. They have no impact on the functionality of GitLab so this change is non-functional in nature.
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Related to #480168 (closed), #480165 (closed)