Add gcc11 to Ubuntu20.04 setup and add PkgConfig install #12926

Job	Run time
Build	24m 40s
Spark Aggregate Fuzzer	15m 44s
Presto Fuzzer	15m 48s
Presto Bias Fuzzer	0s
Join Fuzzer	17m 37s
Exchange Fuzzer	16m 23s
RowNumber Fuzzer	15m 37s
Spark Bias Fuzzer	0s
Spark Fuzzer	16m 37s
Biased Aggregation Fuzzer with Presto as source of truth	0s
Aggregation Fuzzer with Presto as source of truth	17m 32s
Window Fuzzer with Presto as source of truth	17m 31s
Writer Fuzzer with Presto as source of truth	17m 25s
Signature Changes	2s
	2h 54m 56s

Provide feedback