misc: Enable Spark query runner as reference in aggregation fuzzer test #281

Job	Run time
compile	1h 15m 32s
presto-java-aggregation-fuzzer-run	1h 58m 33s
spark-java-aggregation-fuzzer-run	1h 23m 30s
presto-expression-fuzzer-run	30m 44s
linux-join-fuzzer-run	30m 59s
spark-expression-fuzzer-run	30m 40s
	6h 9m 58s

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