v2.0: Revert "rolls back chained Merkle shreds for testnet downgrade (#3194)" (backport of #3503) #12821

Job	Run time
check	3m 22s
cargo-test-sbf (token/program)	10m 47s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	16m 28s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	23m 50s
test (single-pool/cli, single-pool/program)	19m 57s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	12m 6s
test (token-upgrade/cli, token-upgrade/program)	20m 30s
cargo-test-sbf (token-upgrade/program)	11m 22s
cargo-test-sbf (feature-proposal/program)	9m 23s
cargo-test-sbf (governance/addin-mock/program, governance/program)	14m 57s
cargo-test-sbf (memo/program)	9m 8s
cargo-test-sbf (name-service/program)	9m 30s
cargo-test-sbf (stake-pool/program)	14m 16s
cargo-test-sbf (single-pool/program)	9m 54s
	3h 5m 30s

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