Remove `disable_combine_sarif_files` feature flag #7247

Job	Run time
Split workflow (ubuntu-latest, default)	1m 16s
Split workflow (macos-latest, nightly-latest)	2m 2s
Split workflow (macos-latest, linked)	2m 19s
Split workflow (ubuntu-latest, linked)	1m 52s
Split workflow (macos-latest, default)	1m 33s
Split workflow (ubuntu-latest, nightly-latest)	1m 29s
	10m 31s

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