TransactionScheduler: MultiIteratorConsumeScheduler #1559

Job	Run time
cargo-test-sbf (token/program)	13m 45s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	27m 3s
test	0s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	19m 35s
check	0s
cargo-test-sbf (token-upgrade/program)	19m 2s
cargo-test-sbf (feature-proposal/program)	15m 41s
cargo-test-sbf (governance/addin-mock/program, governance/program)	25m 30s
cargo-test-sbf (memo/program)	16m 57s
cargo-test-sbf (name-service/program)	17m 21s
cargo-test-sbf (single-pool/program)	18m 23s
	2h 53m 17s

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