Remove tests and alternative Python implementations

Ad discussed here:
https://github.com/coding-horror/basic-computer-games/issues/548#issuecomment-1081008471

.github/workflows/check-python.yml

@@ -20,9 +20,6 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -r 00_Utilities/python/ci-requirements.txt
-    - name: Test with pytest
-      run: |
-        pytest -m "not slow"
     - name: Test with mypy
       run: |
         mypy . --exclude 79_Slalom --exclude 27_Civil_War --exclude 38_Fur_Trader --exclude 81_Splat --exclude 09_Battle --exclude 40_Gomoko --exclude 36_Flip_Flop --exclude 43_Hammurabi --exclude 04_Awari --exclude 78_Sine_Wave --exclude 77_Salvo --exclude 34_Digits --exclude 17_Bullfight --exclude 16_Bug