[FE Test] Rename nested directory in testdata into nestedClasses

This is needed to avoid clash between generated test class `Nested` and
  `@Nested` annotation from JUnit 5

compiler/testData/loadJava/compiledKotlin/nestedClasses/membersReferenceOuterTP.kt

@@ -0,0 +1,12 @@
+//ALLOW_AST_ACCESS
+package test
+
+class MembersReferenceOuterTP<P> {
+    inner class Inner {
+        fun <Q : P> f() {}
+        fun g(p: P): P = null!!
+
+        val v: P = null!!
+        val <Q : P> Q.w: Q get() = null!!
+    }
+}