Rust: remove shipped feature flag #894

Job	Run time
Upload debug artifacts after failure in analyze (linked)	2m 52s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 47s
Upload debug artifacts after failure in analyze (default)	3m 37s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 8s
Download and check debug artifacts after failure in analyze	18s
	11m 42s

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