Add two lints looking for new fields in `repr(C)` unions. (#1049) #3140

Job	Run time
Run tests (1.81, false)	4m 48s
Check lint and rustfmt	24s
Build binary (Windows)	2m 38s
Run tests (1.82, false)	4m 21s
Build binary	35s
Run tests (stable, false)	4m 17s
Semver: core-graphics	1m 7s
Run tests (beta, false)	4m 28s
Check if version changed	11s
Run tests (nightly, true)	4m 18s
Semver: libp2p-dcutr 1.62.0 and libp2p-relay 0.14.0	1m 8s
Semver: bevy_core v0.9.0	51s
Caching across rustdoc versions	1m 31s
Caching with feature config changed	25s
Semver: libp2p-gossipsub ~0.44.0 + libp2p-request-response ~0.24.0	1m 17s
Semver: libp2p-core 0.37.0	54s
Semver: bevy_gltf v0.9.1	54s
Semver: clap v3.2.0	36s
Semver: libp2p-uds 0.37.0	57s
Semver: dependency has warnings with "-Dwarnings" (libp2p v0.53.1)	1m 4s
Semver: sqllogictest v0.13.0	38s
Semver: tokio ~v1.25.0 (explicit)	5s
Semver: tokio ~v1.25.0 (implicit)	5s
Check failure when installed rustc is too old	14s
Semver: perf-event-open-sys2 v5.0.0	10s
Semver: ref-slice fork (git)	24s
Semver: ref-slice fork (sparse)	12s
Semver: ref-slice fork (Windows) (git)	52s
Semver: ref-slice fork (Windows) (sparse)	49s
All CI stages	1s
Check for semver compliance	0s
Run the release workflow	0s
	40m 14s

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