Sg/preview sanchonet fixes

[SupernaviX]

Description

Fixes several issues I ran into when trying to replace upstream-chain-fetcher with peer-network-interface.

• Add the consensus module to the non-mainnet omnibus configurations. Without this, nothing was listening to their messages, so the system wasn't doing much.
• PeerNetworkInterface wasn't consistently setting new_epoch to true correctly. It was checking if the current slot was the first slot in an epoch, but that is not a reliable detection method because there's no guarantee a block will always be created in that slot. Switch to computing this by tracking the last epoch we reported instead.
• Update parameter_state to download and bundle preview genesis config values. This lets us run more of the system against preview values.
• Fix an issue in utxo_state where the module assumed it never processed block 0.

How was this tested?

I ran omnibus with both the sanchonet and preview configurations. It doesn't make it past epoch 2 on either, but it makes it farther than before.

Checklist

• My code builds and passes local tests
• I added/updated tests for my changes, where applicable
• I updated documentation (if applicable)
• CI is green for this PR

Impact / Side effects

The omnibus preview/sanchonet configurations now actually do something, instead of just spewing blocks into nothingness.

Reviewer notes / Areas to focus