Python: Add tests for functional-like programming

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This can also serve for a place to add tests for constructs like threading.Thread, mulitprocess.Process, concurrent.futures.ThreadPoolExecutor, and concurrent.futures.ProcessPoolExecutor.

Pull Request checklist

All query authors

• [x] A change note is added if necessary. See the documentation in this repository.
• [x] All new queries have appropriate .qhelp. See the documentation in this repository.
• [x] QL tests are added if necessary. See Testing custom queries in the GitHub documentation.
• [x] New and changed queries have correct query metadata. See the documentation in this repository.

Internal query authors only

• [x] Autofixes generated based on these changes are valid, only needed if this PR makes significant changes to .ql, .qll, or .qhelp files. See the documentation (internal access required).
• [x] Changes are validated at scale (internal access required).
• [x] Adding a new query? Consider also adding the query to autofix.