removed two read-only model classes that are useless with Wicket 8+

gui/admin-gui/src/main/java/com/evolveum/midpoint/gui/api/util/WebComponentUtil.java

@@ -22,7 +22,6 @@
 import java.text.Collator;
 import java.text.SimpleDateFormat;
 import java.util.*;
-import java.util.function.Predicate;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 import java.util.stream.StreamSupport;
@@ -87,7 +86,6 @@
 import com.evolveum.midpoint.gui.api.model.LoadableModel;
 import com.evolveum.midpoint.gui.api.model.NonEmptyModel;
 import com.evolveum.midpoint.gui.api.model.ReadOnlyModel;
-import com.evolveum.midpoint.gui.api.model.ReadOnlyValueModel;
 import com.evolveum.midpoint.gui.api.page.PageAdminLTE;
 import com.evolveum.midpoint.gui.api.page.PageBase;
 import com.evolveum.midpoint.gui.api.prism.wrapper.*;
@@ -236,6 +234,7 @@ public final class WebComponentUtil {
     /**
      * To be used only for tests when there's no MidpointApplication.
      * (Quite a hack. Replace eventually by a more serious solution.)
+     * TODO: Not used anymore, consider removal? (If not used in 2024, just delete it.)
      */
     private static RelationRegistry staticallyProvidedRelationRegistry;
 
@@ -1041,15 +1040,6 @@ public static <T extends Enum> IModel<List<T>> createReadonlyModelFromEnum(final
         };
     }
 
-    // use for small enums only
-    @NotNull
-    public static <T extends Enum> IModel<List<T>> createReadonlyValueModelFromEnum(@NotNull Class<T> type, @NotNull Predicate<T> filter) {
-        return new ReadOnlyValueModel<>(
-                Arrays.stream(type.getEnumConstants())
-                        .filter(filter)
-                        .collect(Collectors.toList()));
-    }
-
     /**
      * Simulates task category using task archetype.
      */