Implement package preprocessor2 #4238

Job	Run time
Prepare CodeQL unit test matrix	8s
Run unit tests (cpp, 2.21.4, codeql-cli/v2.21.4, codeql-bundle-v2.21.4, ubuntu-latest-xl, codeql-...	1h 55m 9s
Run unit tests (c, 2.21.4, codeql-cli/v2.21.4, codeql-bundle-v2.21.4, ubuntu-latest-xl, codeql-cl...	39m 4s
Validate test results	5s
	2h 34m 26s

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