Skip external help integration from forks #2725

Job	Run time
Prepare supported CodeQL environment matrix	3s
Run Guideline Recategorization tests	7s
Run release tests	9s
Run analysis report tests (2.18.4, codeql-cli/v2.18.4, codeql-bundle-v2.18.4)	4m 18s
	4m 37s

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