Remove temporal fix for import/export

What does this MR do?

In !17844 (merged) a temporal fix was added to fix #31414 (closed). According to the comments it could have been removed in 12.6.

This MR removes the temporal fix.

Does this MR meet the acceptance criteria?

Conformity

• [ ] Changelog entry
• [ ] Documentation ([if required](https://docs.gitlab.com/ee/development/documentation/workflow.html#when-documentation-is-required))
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content