Remove `disable_combine_sarif_files` feature flag #9855

Job	Run time
check-codeql-versions	31s
analyze-actions	1m 16s
analyze-javascript (ubuntu-22.04)	4m 11s
analyze-javascript (ubuntu-22.04, linked)	3m 52s
analyze-javascript (windows-2025)	6m 16s
analyze-javascript (ubuntu-24.04, linked)	4m 4s
analyze-javascript (macos-14)	5m 22s
analyze-javascript (ubuntu-24.04)	3m 57s
analyze-javascript (windows-2025, linked)	9m 18s
analyze-javascript (windows-2022)	5m 14s
analyze-javascript (macos-13)	7m 42s
analyze-javascript (macos-14, linked)	4m 46s
analyze-javascript (windows-2022, linked)	5m 20s
analyze-javascript (macos-13, linked)	6m 54s
analyze-javascript (macos-15, linked)	5m 4s
analyze-javascript (macos-15)	4m 39s
	1h 18m 26s

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