[JS] Define Node.js version in one place and use a single version everywhere

Consequently, it fixes the inability to run some JS related tests on Apple devices with ARM.

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

@@ -51,7 +51,7 @@ tasks.register("populateNodeModules", Copy) {
 }
 
 node {
-    version = '12.18.0'
+    version = DependenciesKt.getNodejsVersion(project)
     download = true
 }
 
@@ -90,4 +90,4 @@ tasks.check {
     ['Jest', 'Jasmine', 'Mocha', 'Qunit', 'Tape'].each {
         dependsOn createFrameworkTest(it)
     }
-}
+}