v2.0: verifies retransmitter signature on chained Merkle shreds (backport of #1735) #7910

Job	Run time
check	2m 57s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	21m 51s
cargo-test-sbf (token/program)	9m 22s
test (single-pool/cli, single-pool/program)	20m 25s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	15m 23s
test (token-upgrade/cli, token-upgrade/program)	17m 34s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	11m 21s
cargo-test-sbf (token-upgrade/program)	10m 24s
cargo-test-sbf (feature-proposal/program)	9m 1s
cargo-test-sbf (governance/addin-mock/program, governance/program)	13m 21s
cargo-test-sbf (memo/program)	10m 15s
cargo-test-sbf (name-service/program)	9m 44s
cargo-test-sbf (stake-pool/program)	16m 53s
cargo-test-sbf (single-pool/program)	10m 29s
	2h 59m 0s

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