Rust: remove shipped feature flag #747

Job	Run time
Upload debug artifacts after failure in analyze (default)	3m 6s
Upload debug artifacts after failure in analyze (nightly-latest)	2m 53s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 48s
Upload debug artifacts after failure in analyze (linked)	3m 3s
Download and check debug artifacts after failure in analyze	9s
	10m 59s

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