Follow-up from "Enable Project Import to import from remote object storage [RUN ALL RSPEC] [RUN AS-IF-FOSS]"

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The following discussion from !59033 (merged) should be addressed:

• @alexkalderimis started a discussion:

  This is probably OK, but I can't help but feel that the cleaner OO solution here is to have the import_export_upload know how to save itself to a file - then we can just call import_export_upload.save_to(@archive_file), without any of this branching.

  Thoughts?