Rust: remove shipped feature flag #1030

Job	Run time
Upload debug artifacts after failure in analyze (linked)	3m 16s
Upload debug artifacts after failure in analyze (default)	3m 12s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 9s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 49s
Download and check debug artifacts after failure in analyze	10s
	11m 36s

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