generate duplicate proofs for merkle root conflicts

Active on mainnet-beta (epoch 657), testnet (epoch 672) and devnet (epoch 731).

Minimum versions: Agave v1.18.0.

Introduced in solana-labs/solana PR #34270.

Feature id mrkPjRg79B2oK2ZLgd7S3AfEJaX9B6gAF3H9aEykRUS.

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