`flush_slot_cache_with_clean()` takes a single Slot #1816

Job	Run time
check	0s
cargo-test-sbf (token/program)	14m 10s
test	0s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	28m 47s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	20m 20s
cargo-test-sbf (token-upgrade/program)	16m 42s
cargo-test-sbf (feature-proposal/program)	12m 58s
cargo-test-sbf (governance/addin-mock/program, governance/program)	23m 17s
cargo-test-sbf (memo/program)	13m 2s
cargo-test-sbf (name-service/program)	14m 29s
cargo-test-sbf (single-pool/program)	14m 53s
	2h 38m 38s

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