collect_set / collect_list return elements in a different order than Spark #6796

Found while enabling spark.comet.exec.localTableScan.enabled by default in draft PR #6780 (Spark 4.1 SQL tests and [scans] job). Part of #4347.

DataFrameAggregateSuite "collect functions", "collect functions structs", "collect functions should be able to cast to array type with no null values". Spark returns [1,2,3], Comet returns [2,1,3]. Needs a decision: sort in the test, or match Spark's order where it is deterministic.