[TomNaessens]

Adds tested/python/parse-positive/, a small Python example of TESTed's expected-exception check: parse_positive(text) returns the integer for "42" and "7", and raises ValueError("not a positive number") for "0", "-3" and "abc". TESTed checks both the exception type and the message. The Python examples had no exception example yet. It sits in tested/python/, where #63 moves the other Python examples; tested/dirconfig.json already makes it Python, so it works whether or not #63 has merged.

The same exercise exists in C#, C++, Kotlin, JavaScript and TypeScript (each with its own exception type), as decided for https://github.com/dodona-edu/dodona/issues/8847: one small exercise per TESTed feature.

Manual testing instructions

1. In a Dodona dev checkout with seeded data, check out this branch in the local clone of the example repository under data/exercises/ (git fetch && git checkout feature/8847-tested-python-parse-positive).
2. Sign in as zeus (http://dodona.localhost:3000/dev_sign_in/1), open that repository's page and reprocess its activities.
3. Open "Parse a positive number" and submit tested/python/parse-positive/solution/solution.py: all 5 tests pass.
4. Edge case: raise TypeError instead of ValueError: the two valid cases pass and the three exception cases fail.

Verification (dodona-authoring verify skill, ghcr.io/dodona-edu/dodona-tested, universal-judge master)

• DSL validation: valid.
• Reference solution: 5/5 correct; run the way Dodona does with natural_language en and nl: 5/5 each.
• Wrong solution (# wrong): 0/5 correct.
• TypeError instead of ValueError: 2/5 correct (the three exception cases fail).

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