feat: Support array_join(Unknown) #18286

Job	Run time
Build	36m 57s
Build with Clang	0s
Spark Aggregate Fuzzer	15m 56s
Presto Bias Fuzzer	1h 1m 20s
Spark Bias Fuzzer	0s
Memory Arbitration Fuzzer	20m 33s
Presto Fuzzer	0s
Join Fuzzer	17m 43s
Exchange Fuzzer	16m 6s
RowNumber Fuzzer	15m 37s
Spark Fuzzer	1h 34m 44s
Table Evolution Fuzzer	15m 34s
Cache Fuzzer	0s
Biased Aggregation Fuzzer with Presto as source of truth	0s
Aggregation Fuzzer with Presto as source of truth	17m 36s
Window Fuzzer with Presto as source of truth	17m 9s
Biased Expression Fuzzer with Only Added/Updated Functions and Presto as source of truth	2m 14s
Writer Fuzzer with Presto as source of truth	17m 12s
Signature Changes	2s
	5h 48m 43s

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