Create test_generalized_fish_game.py writing tests using pytest for generalized_fish_game.py file

[Jaydon2005]

Tests plotting functions to ensure they produce plots. Test cases cover a variety of scenarios and edge cases to ensure robust testing of the generalized_fish_game,py

[erexer]

once you're ready for a review, move the PR from "Draft" to "Ready for review"

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 42.08%. Comparing base (bc0710a) to head (882eb87). Report is 31 commits behind head on dev.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #108 +/- ## ========================================== + Coverage 2.07% 42.08% +40.00% ========================================== Files 9 10 +1 Lines 529 594 +65 ========================================== + Hits 11 250 +239 + Misses 518 344 -174 ```

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[erexer]

closes https://github.com/IMMM-SFA/msd_uncertainty_ebook/issues/122