Unrevivable trait (#24226)

* unrevivable trait + remove unclonable remnants

* cleanup

* change to hascomp

Content.Server/Traits/Assorted/UnrevivableComponent.cs

@@ -0,0 +1,10 @@
+namespace Content.Server.Traits.Assorted;
+
+/// <summary>
+/// This is used for the urevivable trait.
+/// </summary>
+[RegisterComponent]
+public sealed partial class UnrevivableComponent : Component
+{
+
+}