`ducks` adds backports and deprecated features #3467

Job	Run time
Integration Tests	3m 12s
Rust Actions (Check/Fmt/Clippy) (ubuntu-latest)	44s
cargo-deny	43s
Rust Actions (Check/Fmt/Clippy) (macos-latest)	52s
Test Suite	1m 3s
actionlint	6s
action-sha-pin-check	39s
buf	6s
Kani Proofs (lading_throttle)	53s
Loom Proofs (lading_signal)	5m 49s
Kani Proofs (lading_payload)	58s
	15m 5s

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