chore: add a witness for `enum_variant_missing` #2941

Job	Run time
Build binary (Windows)	1m 49s
Build binary	36s
Semver: core-graphics	51s
Check lint and rustfmt	24s
Check if version changed	22s
Run tests (1.77, false)	2m 43s
Run tests (1.78, false)	2m 52s
Run tests (1.79, false)	2m 56s
Run tests (1.80, false)	2m 50s
Run tests (1.81, false)	2m 59s
Run tests (stable, false)	2m 53s
Run tests (beta, false)	2m 50s
Run tests (nightly, true)	2m 39s
Caching across rustdoc versions	1m 23s
Semver: bevy_core v0.9.0	40s
Caching with feature config changed	27s
Check failure when installed rustc is too old	13s
Semver: bevy_gltf v0.9.1	1m 6s
Semver: clap v3.2.0	52s
Semver: libp2p-dcutr 1.62.0 and libp2p-relay 0.14.0	1m 24s
Semver: libp2p-gossipsub ~0.44.0 + libp2p-request-response ~0.24.0	1m 8s
Semver: libp2p-uds 0.37.0	59s
Semver: dependency has warnings with "-Dwarnings" (libp2p v0.53.1)	1m 11s
Semver: perf-event-open-sys2 v5.0.0	17s
Semver: libp2p-core 0.37.0	1m 1s
Semver: sqllogictest v0.13.0	31s
Semver: ref-slice fork (git)	25s
Semver: tokio ~v1.25.0 (explicit)	3s
Semver: ref-slice fork (sparse)	19s
Semver: tokio ~v1.25.0 (implicit)	2s
Semver: ref-slice fork (Windows) (git)	1m 1s
Semver: ref-slice fork (Windows) (sparse)	57s
All CI stages	4s
Check for semver compliance	0s
Run the release workflow	0s
	40m 47s

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