[Native][Tests] Move existing CExport tests under the InterfaceV1 dir

To avoid collisions with the future InterfaceNone tests

native/native.tests/testData/CExport/InterfaceV1/kt36639/main.kt

@@ -0,0 +1,21 @@
+interface Foo {
+    fun Any.extfoo()
+}
+
+class CFoo1:Foo {
+    override fun Any.extfoo() {
+        when(this) {
+            is CFoo1 -> println("CFoo1::extfoo")
+            is CFoo2 -> println("CFoo2::extfoo")
+            is Int -> println("Int::extfoo")
+        }
+    }
+
+    fun callMe(arg: Any) = arg.extfoo()
+}
+
+class CFoo2:Foo {
+    override fun Any.extfoo() {
+        TODO("Not yet implemented")
+    }
+}