Added migration for generic file ids, working on adding processed items for deleting generic files
Added tests to ensure ProcessedItem is created for each GenericFile delete request
Added method to delete test ProcessedItems
Added ProcessedItem.last_ingested_version
Added ProcessedItem.create_restore_request
Added ProcessedItem.create_delete_request
Fixed a bug in ProcessedItemController.restore
Added processed_item_controller.items_for_delete
Add deletion event AFTER creating ProcessedItem