Fix extra rollbacks on pre-spawned entities

[cBournhonesque]

I noticed several issues that were causing rollbacks:

• I was adding an initial value in the History when I create it in the SpawnHistory set, and then I would add the same value again in the UpdateHistory set. This wasn't an issue when we used heaps for the history component, but now that we switched to linked-lists this was causing issues
• SpawnHistory had no ordering with the avian sets, so it was possible that the spawn_prespawned_history system was running before the physics systems. That means that some components (LinearVelocity, etc.) that are added by avian would only have a history from the following tick, which was causing extra rollbacks.
• I noticed an issue where sometimes we try to add a value to the history even though it already has a value for this tick. I don't know why this can happen, but it needs to be investigated.

With this PR, I notice almost no rollbacks when launching bullets in the spaceships example!