Disable SSD indicator for NPC (#20027)

* Make ActiveNPCComponent shared

* Check if entity have ActiveNPC component

* Make networked

* Fix path

* fix

Content.Shared/NPC/ActiveNPCComponent.cs

@@ -0,0 +1,9 @@
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.NPC;
+
+/// <summary>
+/// Added to NPCs that are actively being updated.
+/// </summary>
+[RegisterComponent, NetworkedComponent]
+public sealed partial class ActiveNPCComponent : Component {}