Add spec of persisted import failure record
What does this MR do and why?
This MR improves the specs of the ImportFailureService to cover more properties of the persisted record.
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 #428063 (closed)