Remove `disable_combine_sarif_files` feature flag #7218

Job	Run time
Split workflow (ubuntu-latest, linked)	1m 13s
Split workflow (ubuntu-latest, nightly-latest)	1m 53s
Split workflow (ubuntu-latest, default)	1m 8s
Split workflow (macos-latest, default)	3m 0s
Split workflow (macos-latest, linked)	1m 52s
Split workflow (macos-latest, nightly-latest)	1m 33s
	10m 39s

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