`RULE-8-7`: Report external identifiers only referenced in single translation units #3471

Job	Run time
Prepare CodeQL unit test matrix	5s
Run unit tests (c, 2.19.4, codeql-cli/v2.19.4, codeql-bundle-v2.19.4, ubuntu-latest-xl, codeql-cl...	34m 9s
Run unit tests (cpp, 2.19.4, codeql-cli/v2.19.4, codeql-bundle-v2.19.4, ubuntu-latest-xl, codeql-...	1h 29m 46s
Validate test results	8s
	2h 4m 8s

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