Add maxMarks to LLMFreeTextQuestionDTO

[sjd210]

The change is very straightforward, but the timing slightly less. This will need to merge first, then a week later the react-app, and the content only once the second release has happened.

The only side effect from this is that people using the old version of the app after the second release will see no maximum marks displayed until they've answered the question, but this isn't a major issue and will be resolved by a refresh so 🤷‍♀️ I think it's fine.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.52%. Comparing base (ce07b47) to head (16b8c7a).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
.../cl/dtg/isaac/dto/IsaacLLMFreeTextQuestionDTO.java	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #722   +/-   ##
=======================================
  Coverage   36.51%   36.52%           
=======================================
  Files         536      536           
  Lines       23692    23702   +10     
  Branches     2856     2857    +1     
=======================================
+ Hits         8652     8658    +6     
- Misses      14181    14185    +4     
  Partials      859      859           

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