fix: waiting for the last simulation before pick best bid

[irrun]

Description

fix: waiting for the last simulation before pick best bid

Rationale

The final round of bid simulation is often interrupted by stopTimer and not fully packed, making it less competitive than local miner and degrading the mev experience.

So we take two steps to optimize it:

1. do not set a stop timer when the bid is packaged;
2. when the local miner fetches the best bid, wait a while for the bid that is being packaged at the time to finish job.

This is a short-term solution. It will be addressed in the long run with a more formal fix and be put into the next stable release.

Example

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Changes

Notable changes:

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