Add `enum_variant_no_longer_non_exhaustive` lint. #3536

Job	Run time
Ensure test crates pass "cargo check"	56s
Run tests (nightly, true)	6m 31s
Run tests (1.84, false)	6m 2s
Build binary	31s
Check lint and rustfmt	22s
Run tests (beta, false)	6m 4s
Build binary (Windows)	4m 6s
Semver: core-graphics	1m 6s
Check if version changed	17s
Run tests (stable, false)	6m 8s
Caching across rustdoc versions	1m 38s
Semver: libp2p-core 0.37.0	1m 9s
Semver: libp2p-dcutr 1.62.0 and libp2p-relay 0.14.0	1m 27s
Caching with feature config changed	40s
Semver: sqllogictest v0.13.0	40s
Semver: clap v3.2.0	53s
Semver: bevy_gltf v0.9.1	1m 1s
Semver: tokio ~v1.25.0 (implicit)	6s
Check failure when installed rustc is too old	21s
Semver: ref-slice fork (sparse)	25s
Semver: ref-slice fork (git)	33s
Semver: libp2p-gossipsub ~0.44.0 + libp2p-request-response ~0.24.0	1m 31s
Semver: tokio ~v1.25.0 (explicit)	4s
Semver: perf-event-open-sys2 v5.0.0	24s
Semver: libp2p-uds 0.37.0	1m 0s
Semver: dependency has warnings with "-Dwarnings" (libp2p v0.53.1)	1m 16s
Semver: bevy_core v0.9.0	37s
Semver: ref-slice fork (Windows) (git)	1m 20s
Semver: ref-slice fork (Windows) (sparse)	1m 0s
All CI stages	2s
Check for semver compliance	0s
Run the release workflow	0s
	48m 10s

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