j2k: flatten test cases and testData directory structure

Move j2k/test/tests -> j2k/tests, j2k/test/testData -> j2k/testData

j2k/testData/fileOrElement/methodCallExpression/collectionsMethods2.kt

@@ -0,0 +1,10 @@
+// ERROR: Too many arguments for public fun <T> listOf(): kotlin.List<T> defined in kotlin
+// ERROR: Too many arguments for public fun <T> setOf(): kotlin.Set<T> defined in kotlin
+import java.util.*
+
+class A {
+    fun foo() {
+        val list = listOf<String>(null)
+        val set = setOf<String>(null)
+    }
+}