Update gitlab:db:reindex tests to run with decomposed database
What does this MR do and why?
Update gitlab:db:reindex tests to run with decomposed database.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #344510 (closed)