Refactor: Use existing sanitizeSortColumn method with item_sort_columns helper

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- Add item_sort_columns() helper function in tabular_helper.php
- Helper returns all sortable columns including dynamic attribute IDs
- Remove duplicate sanitizeSortColumnAttribute method from Items controller
- Remove unused ALLOWED_SORT_COLUMNS constant from Item model
- Reuses existing sanitizeSortColumn method from Secure_Controller

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