bug: Autopilot may create auctions without WETH price

[fleupold]

Problem

The driver expects token prices for all buy and sell tokens in the auction. Yet, it wraps ETH into WETH if necessary:

services/crates/driver/src/domain/competition/auction.rs

Lines 50 to 56 in 50b46e0

	let weth = eth.contracts().weth_address();
	if !orders.iter().all(|order| {
	tokens.0.contains_key(&order.buy.token.wrap(weth))
	&& tokens.0.contains_key(&order.sell.token)
	}) {
	return Err(Error::InvalidTokens);
	}

Yet, when creating the auction we don't ensure we have token prices for both the wrapped native version as well as the 0xe....e placeholder. We only insert the token address specified on the order.

services/crates/autopilot/src/solvable_orders.rs

Lines 472 to 477 in 50b46e0

	let traded_tokens = orders
	.iter()
	.flat_map(|order| [order.data.sell_token, order.data.buy_token])
	.collect::<HashSet<_>>()
	.into_iter()
	.collect::<Vec<_>>();

Impact

If an auction contains only a native token order (and no order trading the wrapped native token equivalent), all drivers will reject the auction.

To reproduce

If you can reproduce the behaviour, steps to reproduce:

1. Start with an empty orderbook
2. Only place a single order buying native ETH in the system
3. See it not getting matched

Expected behaviour

Auctions like this should work normal

Additional context

Logs: https://production-6de61f.kb.eu-central-1.aws.cloud.es.io/app/r/s/bS0Vj