Don't show custom names on display entities (#4309)

* Ensure that a custom text display entity name doesn't show up - it doesn't show on Java, and if we show it, the text display contents aren't shown.

* Update core/src/main/java/org/geysermc/geyser/entity/type/TextDisplayEntity.java

Co-authored-by: Konicai <71294714+Konicai@users.noreply.github.com>

---------

Co-authored-by: Konicai <71294714+Konicai@users.noreply.github.com>

core/src/main/java/org/geysermc/geyser/entity/type/TextDisplayEntity.java

@@ -34,6 +34,7 @@ import org.geysermc.geyser.entity.EntityDefinition;
 import org.geysermc.geyser.session.GeyserSession;
 import org.geysermc.geyser.translator.text.MessageTranslator;
 
+import java.util.Optional;
 import java.util.UUID;
 
 // Note: 1.19.4 requires that the billboard is set to something in order to show, on Java Edition
@@ -56,6 +57,12 @@ public class TextDisplayEntity extends Entity {
         // On JE: Hiding the display name still shows the display entity text.
     }
 
+    @Override
+    public void setDisplayName(EntityMetadata<Optional<Component>, ?> entityMetadata) {
+        // This would usually set EntityDataTypes.NAME, but we are instead using NAME for the text display.
+        // On JE: custom name does not override text display.
+    }
+
     public void setText(EntityMetadata<Component, ?> entityMetadata) {
         this.dirtyMetadata.put(EntityDataTypes.NAME, MessageTranslator.convertMessage(entityMetadata.getValue()));
     }