Predict dumping (#32394)

* Predict dumping

- This got soaped really fucking hard.
- Dumping is predicted, this required disposals to be predicte.d
- Disposals required mailing (because it's tightly coupled), and a smidge of other content systems.
- I also had to fix a compnetworkgenerator issue at the same time so it wouldn't mispredict.

* Fix a bunch of stuff

* nasty merge

* Some reviews

* Some more reviews while I stash

* Fix merge

* Fix merge

* Half of review

* Review

* re(h)f

* lizards

* feexes

* feex

Content.Server/Disposal/Unit/BeingDisposedComponent.cs

@@ -0,0 +1,11 @@
+namespace Content.Server.Disposal.Unit;
+
+/// <summary>
+///     A component added to entities that are currently in disposals.
+/// </summary>
+[RegisterComponent]
+public sealed partial class BeingDisposedComponent : Component
+{
+    [ViewVariables]
+    public EntityUid Holder;
+}