Rust: remove shipped feature flag #9895

Job	Run time
check-codeql-versions	48s
analyze-actions	1m 12s
analyze-javascript (ubuntu-22.04, linked)	5m 5s
analyze-javascript (windows-2022, linked)	6m 56s
analyze-javascript (ubuntu-22.04)	4m 27s
analyze-javascript (ubuntu-24.04)	4m 8s
analyze-javascript (macos-14)	6m 46s
analyze-javascript (ubuntu-24.04, linked)	4m 19s
analyze-javascript (macos-14, linked)	5m 7s
analyze-javascript (windows-2025)	6m 25s
analyze-javascript (macos-13)	10m 24s
analyze-javascript (macos-15, linked)	10m 52s
analyze-javascript (macos-15)	10m 9s
analyze-javascript (macos-13, linked)	10m 29s
analyze-javascript (windows-2022)	8m 7s
analyze-javascript (windows-2025, linked)	6m 33s
	1h 41m 47s

Provide feedback