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/resolve/unqualifiedEnum/nested.fir.txt

@@ -12,6 +12,9 @@ FILE: nested.kt
         public final static fun valueOf(value: R|kotlin/String|): R|Outer| {
         }
 
+        public final static val entries: R|kotlin/enums/EnumEntries<Outer>|
+            public get(): R|kotlin/enums/EnumEntries<Outer>|
+
     }
     public final enum class Inner : R|kotlin/Enum<Inner>| {
         private constructor(): R|Inner| {
@@ -26,6 +29,9 @@ FILE: nested.kt
         public final static fun valueOf(value: R|kotlin/String|): R|Inner| {
         }
 
+        public final static val entries: R|kotlin/enums/EnumEntries<Inner>|
+            public get(): R|kotlin/enums/EnumEntries<Inner>|
+
     }
     public final fun foo(o: R|Outer|, i: R|Inner|): R|kotlin/Int| {
         ^foo when (R|<local>/o|) {