akvo / iwsims / #155

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[#77] Wrap seeder database operations in atomic transactions and add levels option to CSV seeder

- Wrap row processing in seeder_data_processor with transaction.atomic() to ensure database consistency and prevent transaction errors when individual rows fail
- Add --levels option to administration_csv_seeder to import only first N columns for deployments with shallower hierarchies than the CSV file
- Improve error message when CSV has too many levels to suggest using --levels parameter
- Add tests to verify transaction rollback on row failure and levels option functionality

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