Fix unexpected `UnrequestedBlobId` and `ExtraBlocksReturned` errors due to race conditions.#5477

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jimmygchen wants to merge 2 commits intosigp:unstablefrom

jimmygchen:fix-block-lookup-race

Commits on Mar 25, 2024

Fix unexpected `UnrequestedBlobId` and `ExtraBlocksReturned` errors due to race conditions.
jimmygchen
committed

Commits on Mar 26, 2024

Continue chain segment processing and skip any blocks that are already known, rather than returning an error.
jimmygchen
committed