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Keep Kotlin compile configs of composite builds apart #408

Job	Run time
Build scip-java CLI	4m 31s
gradle-kotlin23-turbine	1m 37s
maven-java17-spring-boot	2m 45s
gradle-kotlin-kotlinconf-app	6m 15s
gradle-kotlin19-kotlinpoet	2m 26s
bazel-java-examples	2m 4s
maven-kotlin-json-kotlin-maven	2m 51s
gradle-kotlin24-detekt	4m 50s
gradle-java21-readiness	2m 27s
maven-java25-demo	2m 29s
gradle-mixed-kotlinpoet	3m 53s
gradle-kotlin-kotlinpoet	3m 52s
Repository indexing pass	2s
	40m 2s