Rust: remove shipped feature flag #10023

Job	Run time
check-codeql-versions	45s
analyze-actions	1m 3s
analyze-javascript (ubuntu-22.04, linked)	4m 5s
analyze-javascript (windows-2022)	6m 54s
analyze-javascript (ubuntu-22.04)	4m 6s
analyze-javascript (windows-2022, linked)	7m 44s
analyze-javascript (ubuntu-24.04)	3m 52s
analyze-javascript (ubuntu-24.04, linked)	4m 6s
analyze-javascript (windows-2025, linked)	6m 52s
analyze-javascript (windows-2025)	5m 40s
analyze-javascript (macos-13)	9m 17s
analyze-javascript (macos-13, linked)	9m 3s
analyze-javascript (macos-14, linked)	4m 11s
analyze-javascript (macos-15)	4m 18s
analyze-javascript (macos-14)	5m 24s
analyze-javascript (macos-15, linked)	5m 25s
	1h 22m 45s

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