make GameRule use entity category (#28294)

Content.Server/GameTicking/Components/GameRuleComponent.cs

@@ -1,4 +1,5 @@
 using Content.Server.Destructible.Thresholds;
+using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom;
 
 namespace Content.Server.GameTicking.Components;
@@ -7,7 +8,7 @@ namespace Content.Server.GameTicking.Components;
 /// Component attached to all gamerule entities.
 /// Used to both track the entity as well as store basic data
 /// </summary>
-[RegisterComponent]
+[RegisterComponent, EntityCategory("GameRules")]
 public sealed partial class GameRuleComponent : Component
 {
     /// <summary>