Rust: remove shipped feature flag #9921

Job	Run time
analyze-actions	1m 13s
check-codeql-versions	52s
analyze-javascript (ubuntu-22.04)	4m 8s
analyze-javascript (ubuntu-24.04, linked)	4m 5s
analyze-javascript (ubuntu-22.04, linked)	4m 18s
analyze-javascript (windows-2025)	6m 57s
analyze-javascript (windows-2022, linked)	7m 13s
analyze-javascript (windows-2022)	6m 47s
analyze-javascript (ubuntu-24.04)	4m 8s
analyze-javascript (windows-2025, linked)	7m 29s
analyze-javascript (macos-13, linked)	9m 46s
analyze-javascript (macos-14)	7m 9s
analyze-javascript (macos-14, linked)	5m 24s
analyze-javascript (macos-13)	6m 35s
analyze-javascript (macos-15)	7m 36s
analyze-javascript (macos-15, linked)	8m 29s
	1h 32m 9s

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