Changed Names of Test Classes to be ExerciseNameTest

[BethanyG]

This way, the results will read ExerciseName > test_name without having to resort to a more complicated regex and logic in the Test Runner.

The following exercise test files were changed:

• black_jack_test.py
• lists_test.py
• list_methods_test.py
• exchange_test.py
• arcade_game_test.py
• dicts_test.py
• string_methods_test.py
• strings_test.py
• enums_test.py
• conditionals_test.py
• string_formatting_test.py
• none_test.py
• tuples_test.py

lists_test.py was also edited to omit tests for example code.

[BethanyG]

I tried, but couldn't get the results.json file for making the grade to delete. Much obliged if a reviewer can do it. Otherwise, i will have to submit a follow-on PR.

[kotp]

Looks like the making-the-grade json file is deleted.

Approving