v2.0: blockstore: only consume duplicate proofs from root_slot + 1 on startup (backport of #1971) #7402

Job	Run time
check	3m 24s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	20m 52s
test (single-pool/cli, single-pool/program)	19m 39s
test (token-upgrade/cli, token-upgrade/program)	19m 30s
cargo-test-sbf (token/program)	9m 25s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 31s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 38s
cargo-test-sbf (token-upgrade/program)	8m 51s
cargo-test-sbf (feature-proposal/program)	10m 3s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 38s
cargo-test-sbf (memo/program)	9m 59s
cargo-test-sbf (name-service/program)	8m 39s
cargo-test-sbf (stake-pool/program)	13m 5s
cargo-test-sbf (single-pool/program)	11m 14s
	2h 53m 28s

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