`ducks` adds backports and deprecated features #3461

Job	Run time
action-sha-pin-check	42s
actionlint	6s
buf	8s
cargo-deny	36s
Integration Tests	3m 34s
Kani Proofs (lading_throttle)	1m 2s
Kani Proofs (lading_payload)	1m 5s
Loom Proofs (lading_signal)	5m 59s
Rust Actions (Check/Fmt/Clippy) (ubuntu-latest)	56s
Test Suite	2m 4s
Rust Actions (Check/Fmt/Clippy) (macos-latest)	1m 21s
	17m 33s

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