refactor generator ns with -never-gen helpers #2349

Job	Run time
ClojureScript (none)	2m 48s
Clojure 11 (Java 8)	53s
ClojureScript (advanced)	3m 41s
Babashka	28s
Clojure 12 (Java 8)	1m 0s
ClojureScript (cherry-none)	3m 40s
Clojure 11 (Java 11)	57s
ClojureScript (cherry-advanced)	3m 32s
Clojure 12 (Java 11)	58s
Clojure 11 (Java 17)	57s
Clojure 12 (Java 17)	53s
Clojure 11 (Java 21)	51s
Clojure 12 (Java 21)	51s
	21m 29s

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