fix: Quote string keys for feature selection (#11779) #14762

Job	Run time
Build	1h 0m 25s
Build with Clang	0s
Spark Aggregate Fuzzer	15m 43s
Presto Fuzzer	30m 50s
Aggregation Fuzzer with Presto as source of truth	17m 32s
Join Fuzzer	17m 48s
Presto Bias Fuzzer	0s
Spark Fuzzer	15m 48s
Spark Bias Fuzzer	0s
Exchange Fuzzer	15m 49s
Window Fuzzer with Presto as source of truth	17m 35s
Writer Fuzzer with Presto as source of truth	17m 25s
RowNumber Fuzzer	15m 54s
Signature Changes	7s
Biased Aggregation Fuzzer with Presto as source of truth	0s
Biased Expression Fuzzer with Only Added/Updated Functions and Presto as source of truth	0s
	3h 44m 56s

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