Remove `disable_combine_sarif_files` feature flag #4087

Job	Run time
Resolve environment (macos-latest, nightly-latest)	2m 49s
Resolve environment (windows-latest, linked)	1m 11s
Resolve environment (ubuntu-latest, linked)	34s
Resolve environment (windows-latest, nightly-latest)	3m 46s
Resolve environment (ubuntu-latest, default)	34s
Resolve environment (ubuntu-latest, nightly-latest)	51s
Resolve environment (windows-latest, default)	1m 22s
Resolve environment (macos-latest, linked)	3m 1s
Resolve environment (macos-latest, default)	2m 59s
	17m 7s

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