Move around some codegen box tests

In tests merged from boxAgainstJava in 29b96aa1, some directories were
named slightly differently compared to box, e.g. "property" vs
"properties", "varargs" vs "vararg". This change renames these, moves
some of the tests to more fitting directories, and also renames
"visibility" to "javaVisibility" because it's about Java visibilities
specifically.

compiler/testData/codegen/box/javaVisibility/protectedStatic/funNestedStaticGenericClass.kt

@@ -0,0 +1,24 @@
+// TARGET_BACKEND: JVM
+// MODULE: lib
+// FILE: J.java
+
+public class J<T> {
+    public static class Inner<S> {
+        protected static String protectedFun() {
+            return "OK";
+        }
+    }
+}
+
+// MODULE: main(lib)
+// FILE: 1.kt
+
+class Derived : J.Inner<String>() {
+    fun test(): String {
+        return J.Inner.protectedFun()!!
+    }
+}
+
+fun box(): String {
+    return Derived().test()
+}