Rust: remove shipped feature flag #7300

Job	Run time
Packaging: Action input (windows-latest, linked)	5m 36s
Packaging: Action input (macos-latest, linked)	2m 0s
Packaging: Action input (ubuntu-latest, linked)	1m 28s
Packaging: Action input (ubuntu-latest, default)	1m 31s
Packaging: Action input (windows-latest, nightly-latest)	4m 3s
Packaging: Action input (windows-latest, default)	4m 4s
Packaging: Action input (macos-latest, default)	1m 41s
Packaging: Action input (macos-latest, nightly-latest)	2m 8s
Packaging: Action input (ubuntu-latest, nightly-latest)	1m 24s
	23m 55s

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