[KLIB][tests] Reorganize "klib dump-ir" tests

- Keep the test data under "native/native.tests/testData/klib/" dir
- Rename tests from "klib ir" to "klib dump-ir"

native/native.tests/testData/klib/dump-ir/enum.kt

@@ -0,0 +1,8 @@
+// FIR_IDENTICAL
+package test
+
+enum class Color(val rgb: Int) {
+    RED(0xFF0000),
+    GREEN(0x00FF00),
+    BLUE(0x0000FF)
+}