fix(exex): check exex head against node head to determine canonical #11410
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Motivation
Stumbled upon it when the node crashed during the pipeline sync. On restart, we had a header for the ExEx head block in the database, but the node head was behind it because it looks at the
Finish
stage of the pipeline and the pipeline didn't finish fully for that block yet.Solution
Even if a header for the ExEx head block is found in the database, but it's ahead of the node head, we need to revert the ExEx to the node head.