v2.0: adds feature-gate code to enforce retransmitter signature verification (backport of #1840) #8419

Job	Run time
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	18m 41s
cargo-test-sbf (token/program)	10m 22s
test (single-pool/cli, single-pool/program)	18m 59s
check	4m 9s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	16m 45s
test (token-upgrade/cli, token-upgrade/program)	17m 33s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	14m 58s
cargo-test-sbf (token-upgrade/program)	11m 33s
cargo-test-sbf (feature-proposal/program)	9m 2s
cargo-test-sbf (governance/addin-mock/program, governance/program)	15m 18s
cargo-test-sbf (memo/program)	9m 0s
cargo-test-sbf (name-service/program)	9m 53s
cargo-test-sbf (stake-pool/program)	12m 30s
cargo-test-sbf (single-pool/program)	11m 32s
	3h 0m 15s

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