Rust: remove shipped feature flag #9766

Job	Run time
check-codeql-versions	54s
analyze-actions	58s
analyze-javascript (ubuntu-24.04)	4m 15s
analyze-javascript (ubuntu-24.04, linked)	4m 8s
analyze-javascript (ubuntu-22.04)	4m 9s
analyze-javascript (macos-14, linked)	5m 41s
analyze-javascript (windows-2025, linked)	8m 2s
analyze-javascript (macos-13, linked)	8m 31s
analyze-javascript (windows-2022)	8m 9s
analyze-javascript (windows-2025)	7m 59s
analyze-javascript (macos-15, linked)	3m 34s
analyze-javascript (macos-14)	6m 52s
analyze-javascript (windows-2022, linked)	7m 39s
analyze-javascript (macos-13)	8m 46s
analyze-javascript (macos-15)	11m 49s
analyze-javascript (ubuntu-22.04, linked)	4m 3s
	1h 35m 29s

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