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/DoInsertDisposalUnitEvent.cs

@@ -0,0 +1,4 @@
+namespace Content.Server.Disposal.Unit
+{
+    public record DoInsertDisposalUnitEvent(EntityUid? User, EntityUid ToInsert, EntityUid Unit);
+}