Calculate new "marks" field for question attempts in the database

[sjd210]

This is preparatory work for allowing the marks awarded for LLMFreeTextQuestions (and potentially others in the future like Parsons and those using the Python Code Editor) to be displayed external to the question page itself, such as the markbook. This PR by itself should have no visible effect on either site.

For most questions, marks are calculated as 1 if the answer is correct, and 0 if the answer is incorrect. For LLMFreeTextQuestions, marks are derived from the marksAwarded field of the question response. There is currently no straightforward meaningful way to do this for question types like Parsons without reference to the answer scheme, or Inline since it uses multiple responses.

I've tested backwards compatibility and all seems fine since we are not touching the question_attempt JSON object itself. The plan is to eventually phase out use of the correct column entirely, but for now both exist simultaneously.

Edit: Also sets the correctness criteria for LLMFreeTextQuestions to full marks rather than > 0 marks. For now, this may lead to temporary discrepancy for users on the old API but nothing breaking. For the future, we should consider how we can deal with this more broadly. Should we also be adding a maxMarks column to the database, or are we okay extracting it from the question part whenever relevant since it's unchanging?

[codecov]

Codecov Report

❌ Patch coverage is 36.11111% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.28%. Comparing base (e7c2116) to head (00db082).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...m/cl/dtg/isaac/dos/QuestionValidationResponse.java	0.00%	5 Missing and 1 partial ⚠️
...k/ac/cam/cl/dtg/isaac/quiz/PgQuestionAttempts.java	37.50%	5 Missing ⚠️
...c/dao/PgQuizQuestionAttemptPersistenceManager.java	0.00%	4 Missing ⚠️
...l/dtg/isaac/dto/QuestionValidationResponseDTO.java	40.00%	3 Missing ⚠️
.../dto/LLMFreeTextQuestionValidationResponseDTO.java	0.00%	2 Missing ⚠️
...cl/dtg/isaac/dto/FormulaValidationResponseDTO.java	0.00%	1 Missing ⚠️
...am/cl/dtg/isaac/dto/ItemValidationResponseDTO.java	0.00%	1 Missing ⚠️
...l/dtg/isaac/dto/QuantityValidationResponseDTO.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #731      +/-   ##
==========================================
- Coverage   37.29%   37.28%   -0.01%     
==========================================
  Files         536      536              
  Lines       23709    23728      +19     
  Branches     2861     2864       +3     
==========================================
+ Hits         8843     8848       +5     
- Misses      13984    13997      +13     
- Partials      882      883       +1     

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