De-dupe inbound SCP traffic #6309

Job	Run time
rust-check-git-rev-deps	20s
fmt	16s
cargo-deny (advisories)	46s
build (gcc, current)	54m 36s
cargo-deny (bans licenses sources)	44s
build (gcc, current, --check-test-tx-meta)	45m 40s
build (gcc, next)	57m 2s
build (gcc, next, --check-test-tx-meta)	44m 27s
build (clang, current)	52m 15s
build (clang, current, --check-test-tx-meta)	38m 3s
build (clang, next)	49m 35s
build (clang, next, --check-test-tx-meta)	39m 31s
complete	1s
	6h 23m 16s

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