Revert last changes that caused performance regressions (#351) #579

Job	Run time
Sjsonnet build for jvm on JDK 17	4m 33s
Sjsonnet build for jvm on JDK 21	4m 40s
Sjsonnet build for js on JDK 17	3m 4s
Sjsonnet build for js on JDK 21	3m 26s
Sjsonnet build for native on JDK 17	3m 46s
Sjsonnet build for native on JDK 21	3m 59s
	23m 28s

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