Rust: remove shipped feature flag #738

Job	Run time
Upload debug artifacts after failure in analyze (nightly-latest)	2m 55s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 57s
Upload debug artifacts after failure in analyze (linked)	3m 1s
Upload debug artifacts after failure in analyze (default)	3m 10s
Download and check debug artifacts after failure in analyze	11s
	11m 14s

Provide feedback