KT-56687: Unify handling of EnumEntries.

`supportsEnumEntries` in `EnumCLassLowering` is not really
needed, but it was left just in case.
Both K1 and K2 ensure the feature is
enabled before they generate IR.

`supportsEnumEntries` is not enough, because the frontend will not
generate `entries` if `kotlin.enums.EnumEntries` is not available
(linking against an outdated stdlib is considered a valid use-case).

From the resolution point of view,
it's OK to resolve into `entries` while
the feature is off, because then K1 reports an error on the call site.

^KT-56687 Fixed
^KT-55614 Fixed

compiler/fir/fir-deserialization/src/org/jetbrains/kotlin/fir/deserialization/ClassDeserialization.kt

@@ -245,6 +245,10 @@ fun deserializeClassToSymbol(
         session.deserializedClassConfigurator?.run {
             configure(classId)
         }
+
+        if (!Flags.HAS_ENUM_ENTRIES.get(flags)) {
+            hasNoEnumEntriesAttr = true
+        }
     }
 }