Remove SpreaderNodeGroup (#20230)

* Remove SpreaderNodeGroup

* Fix airtight updates

* more smoke stuff

* more smoke fixes

* wtf is smoke code

* Fix merge

* Fix divide by zero

Content.Shared/Spreader/EdgeSpreaderPrototype.cs

@@ -9,4 +9,5 @@ namespace Content.Shared.Spreader;
 public sealed class EdgeSpreaderPrototype : IPrototype
 {
     [IdDataField] public string ID { get; } = string.Empty;
+    [DataField(required:true)] public int UpdatesPerSecond;
 }