Revert "rolls back chained Merkle shreds for testnet downgrade (#3194)" #12799

Job	Run time
check	4m 53s
cargo-test-sbf (token/program)	9m 5s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	16m 27s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	19m 20s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 57s
test (single-pool/cli, single-pool/program)	18m 52s
cargo-test-sbf (token-upgrade/program)	9m 10s
test (token-upgrade/cli, token-upgrade/program)	17m 18s
cargo-test-sbf (feature-proposal/program)	8m 42s
cargo-test-sbf (governance/addin-mock/program, governance/program)	14m 48s
cargo-test-sbf (memo/program)	12m 45s
cargo-test-sbf (name-service/program)	9m 54s
cargo-test-sbf (stake-pool/program)	12m 35s
cargo-test-sbf (single-pool/program)	9m 38s
	2h 54m 24s

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