WIP: Try to discard data we don't need immediately when importing
What does this MR do?
Try to discard data we don't need immediately when importing
Are there points in the code the reviewer needs to double check?
I'll try to check if this could reduce memory footprint
Why was this MR needed?
To try use less memory
Does this MR meet the acceptance criteria?
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Tests added for this feature/bug - Review
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Has been reviewed by Backend
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What are the relevant issue numbers?
Closes #38873