Rust: remove shipped feature flag #10024

Job	Run time
analyze-actions	1m 4s
check-codeql-versions	45s
analyze-javascript (ubuntu-22.04, linked)	4m 10s
analyze-javascript (ubuntu-24.04, linked)	4m 7s
analyze-javascript (ubuntu-22.04)	3m 59s
analyze-javascript (windows-2025)	5m 59s
analyze-javascript (ubuntu-24.04)	4m 12s
analyze-javascript (windows-2025, linked)	6m 25s
analyze-javascript (macos-13)	6m 30s
analyze-javascript (windows-2022)	6m 28s
analyze-javascript (macos-14, linked)	4m 30s
analyze-javascript (macos-13, linked)	9m 42s
analyze-javascript (windows-2022, linked)	5m 54s
analyze-javascript (macos-15)	5m 43s
analyze-javascript (macos-14)	5m 52s
analyze-javascript (macos-15, linked)	6m 8s
	1h 21m 28s

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