v2.0: rolls out chained Merkle shreds to ~5% of testnet (backport of … #8414

Job	Run time
check	4m 50s
cargo-test-sbf (token/program)	9m 5s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	16m 26s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	18m 22s
test (single-pool/cli, single-pool/program)	18m 24s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	11m 22s
test (token-upgrade/cli, token-upgrade/program)	18m 23s
cargo-test-sbf (token-upgrade/program)	10m 0s
cargo-test-sbf (feature-proposal/program)	10m 0s
cargo-test-sbf (governance/addin-mock/program, governance/program)	15m 33s
cargo-test-sbf (memo/program)	8m 50s
cargo-test-sbf (name-service/program)	10m 12s
cargo-test-sbf (stake-pool/program)	14m 59s
cargo-test-sbf (single-pool/program)	11m 22s
	2h 57m 48s

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