Validate that client prototypes are serializable (#18780)

Content.Shared/Atmos/Components/PipeAppearanceComponent.cs

@@ -1,11 +1,10 @@
+using Robust.Shared.Utility;
+
 namespace Content.Shared.Atmos.Components;
 
 [RegisterComponent]
 public sealed class PipeAppearanceComponent : Component
 {
-    [DataField("rsi")]
-    public string RsiPath = "Structures/Piping/Atmospherics/pipe.rsi";
-
-    [DataField("baseState")]
-    public string State = "pipeConnector";
+    [DataField("sprite")]
+    public SpriteSpecifier.Rsi Sprite = new(new("Structures/Piping/Atmospherics/pipe.rsi"), "pipeConnector");
 }