Do not require blobs from checkpoint servers from Fulu epochs. #8413
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Looks good.
From my understanding the ClientGenesis::WeakSubjSszBytes variant is when then data (block, state and blob) is provided, i.e., during manual checkpoint sync. I will put this small update in the PR about updating Lighthouse book
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Issue Addressed
Addressed this comment here: #6837 (comment)
Lighthouse can only checkpoint sync from a server that can serve blob sidecars, which means they need to be at least custdoying 50% of columns (semi-supernodes)
This PR lifts this constraint, as blob sidecar endpoint is getting deprecated in Fulu, and we plan to fetch the checkpoint data columns from peers (#6837)