Fix `upload-sarif` potentially initialising CodeQL twice #7308

Job	Run time
Split workflow (ubuntu-latest, linked)	1m 35s
Split workflow (ubuntu-latest, nightly-latest)	1m 46s
Split workflow (macos-latest, nightly-latest)	3m 7s
Split workflow (ubuntu-latest, default)	1m 33s
Split workflow (macos-latest, linked)	3m 38s
Split workflow (macos-latest, default)	2m 47s
	14m 26s

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