Rust: remove shipped feature flag #7303

Job	Run time
Packaging: Config file (ubuntu-latest, default)	1m 22s
Packaging: Config file (macos-latest, default)	2m 15s
Packaging: Config file (ubuntu-latest, linked)	1m 23s
Packaging: Config file (windows-latest, default)	3m 31s
Packaging: Config file (windows-latest, linked)	3m 18s
Packaging: Config file (macos-latest, linked)	1m 54s
Packaging: Config file (macos-latest, nightly-latest)	1m 38s
Packaging: Config file (ubuntu-latest, nightly-latest)	1m 25s
Packaging: Config file (windows-latest, nightly-latest)	3m 37s
	20m 23s

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