`ducks` adds backports and deprecated features #3476

Job	Run time
cargo-deny	36s
Integration Tests	3m 13s
Kani Proofs (lading_throttle)	57s
Loom Proofs (lading_signal)	5m 55s
Kani Proofs (lading_payload)	1m 5s
Rust Actions (Check/Fmt/Clippy) (ubuntu-latest)	38s
Test Suite	33m 24s
Rust Actions (Check/Fmt/Clippy) (macos-latest)	1m 4s
actionlint	3s
action-sha-pin-check	37s
buf	6s
	47m 38s

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