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/loadJava/compiledJava/enum/EnumWithSpecializedEntry.fir.txt

@@ -7,6 +7,9 @@ public final enum class EnumWithSpecializedEntry : R|kotlin/Enum<test/EnumWithSp
     public final static fun valueOf(value: R|kotlin/String|): R|test/EnumWithSpecializedEntry| {
     }
 
+    public final static val entries: R|kotlin/enums/EnumEntries<test/EnumWithSpecializedEntry>|
+        public get(): R|kotlin/enums/EnumEntries<test/EnumWithSpecializedEntry>|
+
     public/*package*/ open class Nested : R|kotlin/Any| {
         public/*package*/ constructor(): R|test/EnumWithSpecializedEntry.Nested|