Issue 53498: Sample Manager: Attachment field is lost after export/import round trip #6894
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Rationale
This PR skip File converter for Attachment columns for import and allow string values to be rejected/validated during AttachmentDataIterator processing. The only time AttachmentDataIterator would accept a string attachment currently is during list archive import, where the attachment parents are set. There will be a follow up PR that addresses QUS of attachment.
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