Remove support for combining SARIF runs with non-unique categories #7110

Job	Run time
Packaging: Config file (windows-latest, linked)	4m 23s
Packaging: Config file (ubuntu-latest, nightly-latest)	1m 7s
Packaging: Config file (macos-latest, linked)	1m 33s
Packaging: Config file (macos-latest, nightly-latest)	1m 17s
Packaging: Config file (ubuntu-latest, default)	1m 12s
Packaging: Config file (ubuntu-latest, linked)	1m 19s
Packaging: Config file (windows-latest, nightly-latest)	4m 12s
Packaging: Config file (windows-latest, default)	6m 37s
Packaging: Config file (macos-latest, default)	1m 30s
	23m 10s

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