Migrate "marksAwarded" field to "marks" in question_attempts JSON

[sjd210]

Also requires isaacphysics/isaac-react-app#1960

The database migration will only need to be applied to Ada on live (although both sites on staging) since LLM-marked questions were never enabled for Sci. It should be safe to do right away/on release since the old API will still be writing to both marksAwarded and marks. It may mean that some stragglers still also contain marksAwarded in their JSON, but this should be safe (just slightly redundant).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.91%. Comparing base (044f0a5) to head (c30fec7).
⚠️ Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #755      +/-   ##
==========================================
- Coverage   39.92%   39.91%   -0.01%     
==========================================
  Files         545      545              
  Lines       23892    23887       -5     
  Branches     2873     2873              
==========================================
- Hits         9539     9535       -4     
+ Misses      13443    13442       -1     
  Partials      910      910              

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