feat(pbs): Log auction participants with bid value and delta at INFO level

[selfuryon]

We have auction logs in Vouch which I really like. This log shows bid auction and who won it with which value, so I also want to add that type of logs in PBS module too

[selfuryon]

Failed test isn't from my code :)

[selfuryon]

This PR should fix tests: #427

[JasonVranek]

An issue is if the max bid is the same across relays there will be multiple logs with selected = true. You can add more logic to set selected but potentially a more efficient approach that avoids pushing the losing GetHeaderResponses to a vec is:

// ....letmut relay_bids:Vec<(&str,U256,B256)> = Vec::with_capacity(relays.len());letmut best_value = U256::ZERO;letmut best_response:Option<GetHeaderResponse> = None;letmut best_relay_id:Option<&str> = None;for(i, res)in results.into_iter().enumerate(){let relay_id = relays[i].id.as_str();match res {Ok(Some(res)) => {let value = *res.data.message.value();let block_hash = res.block_hash();RELAY_LAST_SLOT.with_label_values(&[relay_id]).set(params.slotasi64);let value_gwei = (value / U256::from(1_000_000_000)).try_into().unwrap_or_default();RELAY_HEADER_VALUE.with_label_values(&[relay_id]).set(value_gwei);if best_response.is_none() || value > best_value {
best_value = value;
best_response = Some(res);// move winner here
best_relay_id = Some(relay_id);}else{// buffer small fields for logging
relay_bids.push((relay_id, value, block_hash));}}Ok(_) => {}Err(err)if err.is_timeout() => error!(err = "Timed Out", relay_id),Err(err) => error!(%err, relay_id),}}// Log winner first (if any)ifletSome(winner) = best_response.as_ref(){let relay_id = best_relay_id.unwrap_or("unknown");info!(
relay_id,
value = %best_value,
value_eth = format_ether(best_value),
value_delta = %U256::ZERO,
selected = true,
block_hash = %winner.block_hash(),"Auction participant");}// Log the restfor(relay_id, value, block_hash)in relay_bids {let delta = best_value.saturating_sub(value);info!(
relay_id,
value = %value,
value_eth = format_ether(value),
value_delta = %delta,
selected = false,
block_hash = %block_hash,"Auction participant");}// Return the moved winning responselet max_bid = best_response;Ok(max_bid)

[JasonVranek]

closed by #443