Fix CDS extractor `findPackageJsonDirs` function #1245

Job	Run time
Create CodeQL Unit Test Matrix	8s
Run Unit Tests (2.20.4, codeql-cli/v2.20.4, codeql-bundle-v2.20.4, ubuntu-latest, codeql-cli_v2.2...	19m 11s
Validate test results	8s
	19m 27s

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