Rust: remove shipped feature flag #10014

Job	Run time
check-codeql-versions	41s
analyze-actions	59s
analyze-javascript (ubuntu-22.04, linked)	4m 7s
analyze-javascript (ubuntu-22.04)	4m 11s
analyze-javascript (ubuntu-24.04)	4m 15s
analyze-javascript (windows-2025, linked)	5m 43s
analyze-javascript (windows-2022)	6m 23s
analyze-javascript (windows-2025)	6m 51s
analyze-javascript (macos-14)	4m 15s
analyze-javascript (macos-15)	5m 13s
analyze-javascript (macos-14, linked)	5m 11s
analyze-javascript (ubuntu-24.04, linked)	4m 5s
analyze-javascript (macos-13, linked)	11m 23s
analyze-javascript (windows-2022, linked)	5m 58s
analyze-javascript (macos-13)	7m 45s
analyze-javascript (macos-15, linked)	7m 16s
	1h 24m 16s

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