mock-consensus: ⭐ use transaction plan in tests

[cratelyn]

• Tracking issue: 🤝 mock consensus engine for App tests #3588
• tests: 💰 perform a spend using mock consensus engine #3788
• mock-consensus: 💰 execute a spend via mock consensus #3857
• app: 🌸 add context messages to assorted errors #3880
• mock-consensus: 📵 raise default tracing log level in tests #3881

[cratelyn]

i continued to push this along today.

2024-02-23T02:55:09.755882Z  INFO penumbra_app::server::consensus: deliver_tx failed, e: binding signature failed to verify

Caused by:
Invalid signature.
at crates/core/app/src/server/consensus.rs:210
in penumbra_mock_consensus::abci::deliver_tx
in penumbra_mock_consensus::block::execute with height: 1, time: 1708656909

for tomorrow: i'm currently seeing this error in my logs. noticeably, this doesn't propagate into an error. i'll investigate more tomorrow.

update this happens on main prior to this change. i'm going to merge this, and track down the invalid binding signature in a distinct PR under the umbrella of #3788.