Erigon 3: Parallel state flushing #11300
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This PR removes effectively
FlushExtendingForkoverhead at chain tip.The reason why it works is that:
CL just needs FCU to return SUCCESS, and this promise is inherently mantained if the block has already been marked as valid.
What the PR actually do is: if we flush the fork built in NewPayload, return SUCCESS before the flushing (SUCCESS will be logically what would be returned anyway). this pushes the extra computation on Ethereum's idle block time, thus rendering it null and giving CLs more time to process attestations/blobs/etc...