K1/K2: add Enum.entries unconditionally and filter them out in tower

Before this commit, we added Enum.entries only in case when
LanguageFeature.EnumEntries was ON (with an exception in K1/Java case).
In this commit we add Enum.entries unconditionally, and in case
the language feature is OFF we filter them out during tower resolve.

compiler/testData/diagnostics/testsWithJsStdLib/native/externalInterfaceNested.txt

@@ -30,6 +30,7 @@ public external interface I {
         public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 
         // Static members
+        public final /*synthesized*/ val entries: kotlin.enums.EnumEntries<I.E>
         public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): I.E
         public final /*synthesized*/ fun values(): kotlin.Array<I.E>
     }