Uses `IntSet` for `RemoveUnrootedSlotsSynchronization::slots_under_co… #9

Job	Run time
test	0s
check	0s
cargo-test-sbf (token/program)	12m 13s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	24m 18s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	14m 51s
cargo-test-sbf (token-upgrade/program)	17m 37s
cargo-test-sbf (feature-proposal/program)	12m 31s
cargo-test-sbf (governance/addin-mock/program, governance/program)	20m 11s
cargo-test-sbf (memo/program)	13m 13s
cargo-test-sbf (name-service/program)	11m 41s
cargo-test-sbf (stake-pool/program)	25m 13s
cargo-test-sbf (single-pool/program)	13m 11s
	2h 44m 59s

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