Declare batch_size dimension for TestAggregationQueriesRunOnce

test_parquet_count_star_optimization, test_kudu_count_star_optimization, and test_orc_count_star_optimization run their test file twice but change batch_size option in between. They can be made clearer by declaring batch_size test dimension and and let vector permutation run the test twice for different batch_size option.
 
Other doable cleanup include removing unused vector argument in test_sampled_ndv and unused unique_database argument in test_min_multiple_distinct.