Unconditionally disable combining SARIF files for GHES 3.18 #745

Job	Run time
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 47s
Upload debug artifacts after failure in analyze (linked)	3m 2s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 13s
Upload debug artifacts after failure in analyze (default)	2m 58s
Download and check debug artifacts after failure in analyze	10s
	11m 10s

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