Perform SARIF post-processing independently of upload #6095

Job	Run time
Ruby analysis (macos-latest, default)	57s
Ruby analysis (ubuntu-latest, nightly-latest)	48s
Ruby analysis (macos-latest, nightly-latest)	1m 12s
Ruby analysis (ubuntu-latest, default)	51s
Ruby analysis (macos-latest, linked)	1m 4s
Ruby analysis (ubuntu-latest, linked)	54s
	5m 46s

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