Add `compile_fail` to ensure doctests pass in the new test crate. #3113

Job	Run time
Semver: core-graphics	41s
Build binary	24s
Build binary (Windows)	2m 50s
Check lint and rustfmt	14s
Run tests (1.81, false)	4m 12s
Check if version changed	6s
Run tests (1.82, false)	4m 17s
Run tests (stable, false)	4m 2s
Run tests (beta, false)	4m 8s
Run tests (nightly, true)	4m 2s
Caching with feature config changed	24s
Caching across rustdoc versions	1m 29s
Semver: bevy_core v0.9.0	31s
Check failure when installed rustc is too old	15s
Semver: bevy_gltf v0.9.1	59s
Semver: clap v3.2.0	37s
Semver: libp2p-dcutr 1.62.0 and libp2p-relay 0.14.0	1m 17s
Semver: libp2p-gossipsub ~0.44.0 + libp2p-request-response ~0.24.0	1m 35s
Semver: libp2p-uds 0.37.0	50s
Semver: dependency has warnings with "-Dwarnings" (libp2p v0.53.1)	1m 12s
Semver: perf-event-open-sys2 v5.0.0	17s
Semver: ref-slice fork (git)	32s
Semver: libp2p-core 0.37.0	48s
Semver: ref-slice fork (sparse)	14s
Semver: sqllogictest v0.13.0	26s
Semver: tokio ~v1.25.0 (explicit)	8s
Semver: tokio ~v1.25.0 (implicit)	3s
Semver: ref-slice fork (Windows) (git)	1m 17s
Semver: ref-slice fork (Windows) (sparse)	57s
All CI stages	1s
Check for semver compliance	0s
Run the release workflow	0s
	38m 48s

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