Unify and utilize NPROC variable for Linux setup scripts #12475

Job	Run time
Build	41m 30s
Spark Aggregate Fuzzer	15m 45s
Presto Fuzzer	16m 8s
Exchange Fuzzer	16m 19s
Presto Bias Fuzzer	0s
Aggregation Fuzzer with Presto as source of truth	17m 32s
Join Fuzzer	17m 27s
Window Fuzzer with Presto as source of truth	17m 27s
RowNumber Fuzzer	15m 38s
Spark Fuzzer	15m 47s
Spark Bias Fuzzer	0s
Signature Changes	2s
Biased Aggregation Fuzzer with Presto as source of truth	0s
Writer Fuzzer with Presto as source of truth	17m 29s
	3h 11m 4s

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