Narrowly focused implementation of RULE 15-0-1 #4669

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-...	2m 20s
Run unit tests (c, 2.21.4, codeql-cli/v2.21.4, codeql-bundle-v2.21.4, ubuntu-latest-xl, codeql-cl...	4m 18s
Validate test results	4s
	6m 50s

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