Fix `upload-sarif` potentially initialising CodeQL twice #4654

Job	Run time
Config export (ubuntu-latest, linked)	1m 22s
Config export (ubuntu-latest, nightly-latest)	1m 22s
Config export (windows-latest, linked)	3m 26s
Config export (macos-latest, linked)	2m 10s
Config export (macos-latest, nightly-latest)	3m 31s
Config export (windows-latest, nightly-latest)	3m 7s
	14m 58s

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