Rust: remove shipped feature flag #7116

Job	Run time
Packaging: Action input (windows-latest, default)	6m 27s
Packaging: Action input (ubuntu-latest, default)	1m 10s
Packaging: Action input (ubuntu-latest, nightly-latest)	1m 43s
Packaging: Action input (macos-latest, nightly-latest)	1m 51s
Packaging: Action input (windows-latest, linked)	5m 56s
Packaging: Action input (macos-latest, default)	1m 22s
Packaging: Action input (ubuntu-latest, linked)	1m 17s
Packaging: Action input (macos-latest, linked)	1m 36s
Packaging: Action input (windows-latest, nightly-latest)	4m 25s
	25m 47s

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