Replace "marksAwarded" with "marks" field in DTOs

[sjd210]

See isaacphysics/isaac-api#731

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.66%. Comparing base (8074a02) to head (b4bfa3e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #1822    +/-   ##
========================================
  Coverage   41.66%   41.66%            
========================================
  Files         544      544            
  Lines       23848    23848            
  Branches     7904     7051   -853     
========================================
  Hits         9937     9937            
- Misses      13266    13868   +602     
+ Partials      645       43   -602     

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