Improve offline transfer export logging

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Summary

Currently, when relation exports process, logs include information like:

{
  "severity": "INFO",
  "time": "2026-02-13T22:30:03.376Z",
  "correlation_id": "01KHCJ05AE0N2AJYP41BJAXNW2",
  "meta.caller_id": "BulkImports::RelationExportWorker",
  "message": "Exporting relation: labels",
  "importer": "Import/Export",
  "group_id": 38,
  "group_name": "Flightjs",
  "group_path": "flightjs",
  "relation": "labels",
  "number_of_records": 10
}

However, there's no information differentiating logs generated by direct transfer exports and offline transfer exports. For better debugging as offline transfer is implemented, add the following to offline transfer logs:

• offline_export_id of the Import::Offline::Export the relation export belongs to
• import_type

Related

• Related to !218532 (merged) - Create offline transfer export worker
• Related to #576092 (closed)