[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_2.kt

@@ -0,0 +1,20 @@
+// EXCLUDED_CLASSES: one.two/Foo three.four/Bar excluded_classes.test/Foo excluded_classes.test/Bar.Nested excluded_classes.test/Baz.Nested.Nested five.six/Baz
+// MODULE: excluded_classes_library
+
+package excluded_classes.test
+
+class Foo {
+    class Nested {
+        class Nested
+    }
+}
+class Bar {
+    class Nested {
+        class Nested
+    }
+}
+class Baz {
+    class Nested {
+        class Nested
+    }
+}