Fix parent class for split-names-from-dataset-info and first-rows-from-parquet
 split-names-from-dataset-info and first-rows-from-parquet don't need to inherit from DatasetsBasedJobRunner, changing to JobRunner
Fix parent class for split-names-from-dataset-info and first-rows-from-parquet:  split-names-from-dataset-info and first-rows-from-parquet don't need to inherit from DatasetsBasedJobRunner, changing to JobRunner