fix: revert header error message change #10866
Merged
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Currently op-reth and alphanet are not able to communicate properly with op-node because we changed the error message for missing blocks/headers, which op-node does a string match on to decide how to fetch the header otherwise.
This PR reverts that change temporarily until ethereum-optimism/optimism#11759 is merged, which will unblock alphanet progress
Supersedes #10864