Add two lints for cases where enum discriminants are no longer defined. #3110

Job	Run time
Semver: core-graphics	45s
Check lint and rustfmt	15s
Build binary	28s
Build binary (Windows)	2m 9s
Run tests (1.81, false)	3m 30s
Check if version changed	19s
Run tests (1.82, false)	3m 17s
Run tests (stable, false)	3m 35s
Run tests (beta, false)	3m 31s
Run tests (nightly, true)	3m 24s
Check failure when installed rustc is too old	22s
Caching with feature config changed	22s
Caching across rustdoc versions	1m 38s
Semver: bevy_core v0.9.0	32s
Semver: bevy_gltf v0.9.1	56s
Semver: clap v3.2.0	28s
Semver: libp2p-dcutr 1.62.0 and libp2p-relay 0.14.0	1m 8s
Semver: libp2p-gossipsub ~0.44.0 + libp2p-request-response ~0.24.0	1m 11s
Semver: libp2p-uds 0.37.0	52s
Semver: dependency has warnings with "-Dwarnings" (libp2p v0.53.1)	1m 7s
Semver: perf-event-open-sys2 v5.0.0	17s
Semver: ref-slice fork (git)	20s
Semver: ref-slice fork (sparse)	18s
Semver: libp2p-core 0.37.0	1m 57s
Semver: sqllogictest v0.13.0	31s
Semver: tokio ~v1.25.0 (explicit)	5s
Semver: tokio ~v1.25.0 (implicit)	6s
Semver: ref-slice fork (Windows) (git)	1m 40s
Semver: ref-slice fork (Windows) (sparse)	53s
All CI stages	1s
Check for semver compliance	0s
Run the release workflow	0s
	35m 57s

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