Use optimistic head slot when finding common ancestor #4925
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Avoids restarting sync from the finalized slot unnecessarily when optimistic sync is in use.
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PR Description
Use the optimistic head slot (if there is one) rather than the fully verified head slot when finding a common ancestor to start syncing from.
Avoids re-downloading blocks we have already optimistically imported.
Fixed Issue(s)
fixes #4785
Documentation
documentationlabel to this PR if updates are required.Changelog