Add tests for hgs react

[chanomkaimuk]

• HGS reacts are defined in resources/reacts/hgs.json
  • Use keywords in criteria as positive test cases (cases that produce a match)
• Create a test file in tests/test_reacts/ to test for hgs test cases.
• The easiest way is to use the tests/test_reacts/test_reacts_cz.py as a reference.
• To locally test the code: run poetry run python -m pytest tests/ -v -s. You can also just push the code as it will also trigger the actions, but it will take some time.