Rust: remove shipped feature flag #921

Job	Run time
Upload debug artifacts after failure in analyze (linked)	3m 3s
Upload debug artifacts after failure in analyze (default)	3m 12s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 7s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	2m 0s
Download and check debug artifacts after failure in analyze	18s
	11m 40s

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