Free hash table after grouping set/row number spill to release memory plus a hash table fix #11478

Job	Run time
Build	33m 5s
Spark Aggregate Fuzzer	16m 16s
Presto Fuzzer	31m 6s
Exchange Fuzzer	16m 19s
Join Fuzzer	17m 32s
Presto Bias Fuzzer	0s
Spark Fuzzer	15m 41s
Aggregation Fuzzer with Presto as source of truth	17m 27s
Window Fuzzer with Presto as source of truth	17m 26s
Writer Fuzzer with Presto as source of truth	17m 27s
RowNumber Fuzzer	15m 36s
Spark Bias Fuzzer	0s
Signature Changes	3s
Biased Aggregation Fuzzer with Presto as source of truth	0s
	3h 17m 58s

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