Rust: remove shipped feature flag #737

Job	Run time
Upload debug artifacts after failure in analyze (default)	3m 12s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 25s
Upload debug artifacts after failure in analyze (linked)	3m 5s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 48s
Download and check debug artifacts after failure in analyze	11s
	11m 41s

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