Rust: remove shipped feature flag #9920

Job	Run time
analyze-actions	1m 9s
check-codeql-versions	48s
analyze-javascript (ubuntu-22.04, linked)	4m 13s
analyze-javascript (ubuntu-24.04, linked)	4m 14s
analyze-javascript (ubuntu-22.04)	4m 2s
analyze-javascript (ubuntu-24.04)	4m 33s
analyze-javascript (windows-2022)	6m 33s
analyze-javascript (windows-2022, linked)	6m 22s
analyze-javascript (macos-13)	10m 32s
analyze-javascript (windows-2025, linked)	6m 21s
analyze-javascript (macos-13, linked)	13m 22s
analyze-javascript (windows-2025)	8m 0s
analyze-javascript (macos-15, linked)	4m 54s
analyze-javascript (macos-14, linked)	5m 46s
analyze-javascript (macos-14)	6m 17s
analyze-javascript (macos-15)	10m 25s
	1h 37m 31s

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