JS: report errors on different external items:

* data classes
* val/var parameters of primary constructors
* enum entry with body
* anonymous `init {}` block in classes

compiler/testData/diagnostics/testsWithJsStdLib/native/enumEntry.kt

@@ -0,0 +1,7 @@
+external enum class E {
+    X,
+    Y <!EXTERNAL_ENUM_ENTRY_WITH_BODY!>{
+        fun foo()
+    }<!>,
+    Z <!EXTERNAL_ENUM_ENTRY_WITH_BODY!>{}<!>
+}