Remove `disable_combine_sarif_files` feature flag #5157

Job	Run time
Ruby analysis (macos-latest, default)	1m 40s
Ruby analysis (macos-latest, linked)	1m 10s
Ruby analysis (ubuntu-latest, nightly-latest)	1m 6s
Ruby analysis (ubuntu-latest, linked)	47s
Ruby analysis (ubuntu-latest, default)	48s
Ruby analysis (macos-latest, nightly-latest)	1m 33s
	7m 4s

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