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/fir/analysis-tests/testData/loadCompiledKotlin/enum/InnerEnumExistingClassObject.txt

@@ -11,6 +11,9 @@ public final class A : R|kotlin/Any| {
         public final static fun values(): R|kotlin/Array<test/A.E>| {
         }
 
+        public final static val entries: R|kotlin/enums/EnumEntries<test/A.E>|
+            public get(): R|kotlin/enums/EnumEntries<test/A.E>|
+
         private constructor(): R|test/A.E|
 
         public final static enum entry ENTRY: R|test/A.E|