Fix kickoff_play_test.py validations

[nycrat]

Description of the task

Currently, kickoff_play_test.py has some incorrect validation logic such a NumberOfRobotsAlwaysStaysInRegion(..., req_robot_cnt=0) which always evaluates to true. We should fix these issues and also make the validation code more readable, perhaps including a diagram to explain what specifically needs to be validated in order to follow the robocup rules

Acceptance criteria

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Blocked By