Rust: remove shipped feature flag #10022

Job	Run time
analyze-actions	1m 2s
check-codeql-versions	39s
analyze-javascript (windows-2022, linked)	6m 7s
analyze-javascript (windows-2022)	6m 29s
analyze-javascript (windows-2025, linked)	6m 47s
analyze-javascript (windows-2025)	6m 8s
analyze-javascript (ubuntu-22.04, linked)	4m 0s
analyze-javascript (macos-13, linked)	7m 14s
analyze-javascript (ubuntu-24.04, linked)	4m 4s
analyze-javascript (ubuntu-24.04)	4m 0s
analyze-javascript (ubuntu-22.04)	4m 4s
analyze-javascript (macos-14)	6m 8s
analyze-javascript (macos-14, linked)	7m 25s
analyze-javascript (macos-13)	12m 3s
analyze-javascript (macos-15)	5m 28s
analyze-javascript (macos-15, linked)	6m 39s
	1h 28m 17s

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