blockchain: Optimize stake node pruning. #2943
Merged
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This optimizes the logic that prunes stake nodes when connecting blocks to make use of the best known header instead of the latest known checkpoint.
While here, it also adds an exported method to the block index to retrieve the best header node under the block index mutex and updates the various call sites that do it manually to use the newly exported function instead as well as exports the block index flush function to make it more consistent with the other funcs that are safe for concurrent access.