Add AR Validation for presences of file_store columns
What does this MR do?
This MR adds AR validations for presences of file_store columns(CarrierWave related).
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Review
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Has been reviewed by Backend -
Has been reviewed by Database
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End-to-end tests pass ( package-and-qa
manual pipeline job)
What are the relevant issue numbers?
Related https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18557