Unconditionally disable combining SARIF files for GHES 3.18 #744

Job	Run time
Upload debug artifacts after failure in analyze (linked)	2m 53s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 46s
Upload debug artifacts after failure in analyze (default)	3m 0s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 5s
Download and check debug artifacts after failure in analyze	10s
	10m 54s

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