Rust: remove shipped feature flag #1018

Job	Run time
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 56s
Upload debug artifacts after failure in analyze (linked)	3m 38s
Upload debug artifacts after failure in analyze (default)	3m 13s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 17s
Download and check debug artifacts after failure in analyze	10s
	12m 14s

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