leader: do not perform blockstore check in next_leader_slot #8532

Job	Run time
cargo-test-sbf (token/program)	5m 59s
check	4m 6s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	6m 2s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	6m 1s
test (single-pool/cli, single-pool/program)	6m 0s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	6m 1s
test (token-upgrade/cli, token-upgrade/program)	6m 1s
cargo-test-sbf (token-upgrade/program)	5m 59s
cargo-test-sbf (feature-proposal/program)	6m 1s
cargo-test-sbf (governance/addin-mock/program, governance/program)	6m 3s
cargo-test-sbf (memo/program)	6m 2s
cargo-test-sbf (name-service/program)	6m 2s
cargo-test-sbf (stake-pool/program)	5m 58s
cargo-test-sbf (single-pool/program)	6m 3s
	1h 22m 18s

Provide feedback