Treat an empty features string as a no-op like Cargo does #1672

Job	Run time
Build binary	1m 6s
Semver: core-graphics	1m 44s
Check lint and rustfmt	41s
Build binary (Windows)	2m 4s
Run tests (1.70, false)	2m 1s
Check if version changed	10s
Run tests (1.71, false)	2m 7s
Run tests (1.72, false)	1m 40s
Run tests (stable, false)	1m 39s
Run tests (beta, false)	2m 7s
Run tests (nightly, true)	1m 47s
Semver: libp2p-gossipsub ~0.44.0 + libp2p-request-response ~0.24.0	1m 40s
Semver: bevy_core v0.9.0	55s
Caching with feature config changed	31s
Caching across rustdoc versions	2m 32s
Semver: bevy_gltf v0.9.1	1m 57s
Semver: libp2p-dcutr 1.62.0 and libp2p-relay 0.14.0	1m 48s
Semver: libp2p-uds 0.37.0	1m 4s
Semver: libp2p-core 0.37.0	1m 59s
Semver: sqllogictest v0.13.0	1m 0s
Check failure when installed rustc is too old	20s
Semver: clap v3.2.0	1m 2s
Semver: perf-event-open-sys2 v5.0.0	17s
Semver: ref-slice fork (git)	1m 20s
Semver: tokio ~v1.25.0 (explicit)	1m 10s
Semver: ref-slice fork (sparse)	19s
Semver: tokio ~v1.25.0 (implicit)	54s
Semver: ref-slice fork (Windows) (git)	2m 9s
Semver: ref-slice fork (Windows) (sparse)	1m 3s
All CI stages	2s
Check for semver compliance	0s
Run the release workflow	0s
	39m 8s

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