[KLIB] Keep "API for KLIB ABI" test data under "compiler/testData/klib/" dir

The test data is used both in ":kotlin-util-klib-abi" and
":native:native.tests" modules. It's better to keep it together with
the test data for other KLIB tests which are also used in more than one
module, i.e. in "compiler/testData/klib/" dir.

compiler/testData/klib/dump-abi/content/excluded_classes_3.v2.txt

@@ -0,0 +1,15 @@
+// Rendering settings:
+// - Signature version: 2
+// - Show manifest properties: false
+// - Show declarations: true
+
+// Library unique name: <excluded_classes_library>
+final class /Bar { // /Bar|null[0]
+    constructor <init>() // /Bar.<init>|<init>(){}[0]
+}
+final class /Baz { // /Baz|null[0]
+    constructor <init>() // /Baz.<init>|<init>(){}[0]
+    final class Nested { // /Baz.Nested|null[0]
+        constructor <init>() // /Baz.Nested.<init>|<init>(){}[0]
+    }
+}