Rust: remove shipped feature flag #9922

Job	Run time
analyze-actions	1m 10s
check-codeql-versions	51s
analyze-javascript (ubuntu-24.04)	4m 16s
analyze-javascript (ubuntu-22.04)	4m 11s
analyze-javascript (ubuntu-22.04, linked)	4m 5s
analyze-javascript (ubuntu-24.04, linked)	4m 11s
analyze-javascript (windows-2025)	7m 51s
analyze-javascript (windows-2022, linked)	6m 41s
analyze-javascript (macos-14)	5m 2s
analyze-javascript (macos-13)	10m 4s
analyze-javascript (macos-13, linked)	8m 30s
analyze-javascript (macos-14, linked)	5m 5s
analyze-javascript (windows-2022)	6m 31s
analyze-javascript (macos-15, linked)	9m 46s
analyze-javascript (windows-2025, linked)	6m 20s
analyze-javascript (macos-15)	7m 47s
	1h 32m 21s

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