j2k: flatten test cases and testData directory structure

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

j2k/testData/fileOrElement/constructors/artificialPrimary.kt

@@ -0,0 +1,18 @@
+// ERROR: 'public fun Test(s: kotlin.String): Test' is already defined in root package
+// ERROR: 'public constructor Test(s: kotlin.String)' is already defined in root package
+// ERROR: None of the following functions can be called with the arguments supplied:  public fun Test(): Test defined in root package public fun Test(s: kotlin.String): Test defined in root package public constructor Test(s: kotlin.String) defined in Test
+// ERROR: Overload resolution ambiguity:  public fun Test(s: kotlin.String): Test defined in root package public constructor Test(s: kotlin.String) defined in Test
+public fun Test(): Test {
+    val __ = Test(null)
+    __.b = true
+    return __
+}
+
+public fun Test(s: String): Test {
+    return Test(s)
+}
+
+public class Test(private val s: String) {
+    var b: Boolean = false
+    var d: Double = 0.toDouble()
+}