Unconditionally disable combining SARIF files for GHES 3.18 #2426

Job	Run time
Autobuild direct tracing (windows-latest, nightly-latest)	3m 47s
Autobuild direct tracing (windows-latest, linked)	3m 29s
Autobuild direct tracing (ubuntu-latest, nightly-latest)	1m 33s
Autobuild direct tracing (ubuntu-latest, linked)	1m 29s
	10m 18s

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