v2.0: rolls out chained Merkle shreds to ~5% of testnet (backport of #2389) #8399

Job	Run time
check	8m 1s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	23m 55s
cargo-test-sbf (token/program)	16m 6s
test (single-pool/cli, single-pool/program)	22m 19s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	17m 2s
test (token-upgrade/cli, token-upgrade/program)	15m 49s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	12m 2s
cargo-test-sbf (token-upgrade/program)	8m 41s
cargo-test-sbf (feature-proposal/program)	11m 43s
cargo-test-sbf (governance/addin-mock/program, governance/program)	14m 25s
cargo-test-sbf (memo/program)	11m 25s
cargo-test-sbf (name-service/program)	11m 12s
cargo-test-sbf (stake-pool/program)	13m 24s
cargo-test-sbf (single-pool/program)	14m 4s
	3h 20m 8s

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