[K/N] Modularise :kotlin-native:native.backend to extract objc header generation (2/2)

^KT-63905 Fixed

repo/gradle-build-conventions/buildsrc-compat/src/main/kotlin/tasks.kt

@@ -103,16 +103,6 @@ enum class JUnitMode {
     JUnit4, JUnit5
 }
 
-/**
- * Convenience function to expose Project.projectTest for groovy
- */
-fun projectTest(project: Project) = project.projectTest()
-
-/**
- * Convenience function to expose Project.projectTest for groovy
- */
-fun projectTest(project: Project, jUnitMode: JUnitMode) = project.projectTest(jUnitMode = jUnitMode)
-
 /**
  * @param parallel is redundant if @param jUnit5Enabled is true, because
  *   JUnit5 supports parallel test execution by itself, without gradle help