Use separate method for preparing audit data

[dylankb]

Using something like the method below will clean up auditFile

prepareAuditData(shards, shaIds) {
    return shaIds.reduce((acc, shaId) => {
      acc[shaId] = {};

      shards[shaId].forEach((shardId) => {
        acc[shaId][shardId] = false;
      });

      return acc;
    }, {});
  }