fix startup after BN exited between head and finalized blocks updates#5617
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When the BN exits after writing new `head` to database, but before completing the `updateFinalizedBlocks` call, the database is slightly inconsistent due to the partial write. We currently fail to start up after that. Fix that by catching up on partial `updateFinalizedBlocks` tasks on start up, and add a test for this edge case.
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When the BN exits after writing new
headto database, but before completing theupdateFinalizedBlockscall, the database is slightly inconsistent due to the partial write. We currently fail to start up after that. Fix that by catching up on partialupdateFinalizedBlockstasks on start up, and add a test for this edge case.