Prevent negative marks in quizzes, tests, exams and notify instructors of invalid input

[Vincamine]

Current Behavior

Currently, if a quiz/test/exam question is assigned a negative mark (e.g., marks: -1), the system accepts the value without any validation, warning, or error. There is no mechanism to notify instructors that negative marks are not supported or may be unintended.

Expected Behavior

• Add a validation logic to ensure the scoring logic never processes negative marks silently — either reject or default them explicitly.
• Add Error message/log warning (e.g., using errorf) in the template engine when .marks < 0.
• Display a validation phase in UI if negative marks are found in the YAML.
• Update the behavior accordingly in the Academy related Documentations.

Screenshots/Logs

Environment

• Host OS: Mac Linux Windows

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[Vincamine]

The closed PR above suggests the position may need to change in the source code and can be used as a reference