v1.18: adds rollout path for chained Merkle shreds (backport of #35076) #7646

Job	Run time
cargo-test-sbf (token/program)	7m 21s
check	0s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 52s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 55s
test	0s
cargo-test-sbf (token-upgrade/program)	7m 29s
cargo-test-sbf (feature-proposal/program)	6m 45s
cargo-test-sbf (governance/addin-mock/program, governance/program)	11m 15s
cargo-test-sbf (memo/program)	8m 2s
cargo-test-sbf (name-service/program)	6m 10s
cargo-test-sbf (stake-pool/program)	11m 5s
cargo-test-sbf (single-pool/program)	8m 33s
	1h 33m 27s

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