[repo] Migrate Groovy build scripts to use 'kotlinStdlib()' directly from buildSrc

libraries/kotlin.test/js/build.gradle

@@ -10,7 +10,7 @@ configurations {
 dependencies {
     expectedBy project(':kotlin-test:kotlin-test-common')
     expectedBy project(':kotlin-test:kotlin-test-annotations-common')
-    api kotlinStdlib("js")
+    api RepoDependencies.kotlinStdlib(project, "js")
 }
 
 compileKotlin2Js {

libraries/kotlin.test/js/it/build.gradle

@@ -54,7 +54,7 @@ tasks.register("populateNodeModules", Copy) {
 }
 
 node {
-    version = DependenciesKt.getNodejsVersion(project)
+    version = RepoDependencies.getNodejsVersion(project)
     download = true
 }