consume duplicate proofs from blockstore in consensus #34372

Active on mainnet-beta (epoch 602), testnet (epoch 614) and devnet (epoch 667).

Introduced in solana-labs/solana PR #34372.

Feature id 6YsBCejwK96GZCkJ6mkZ4b68oP63z2PLoQmWjC7ggTqZ.

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