Add question part status to AssignmentProgressDTO

[mwtrew]

API changes for isaacphysics/isaac-react-app#1489.

I decided to just add this to the existing DTO and endpoint, since it's used in the same place as the other data. There was also some discussion around refactoring assignment progress so the CSV generation uses the same logic, which I think is possible and a good idea, but I'll do that separately to avoid blocking the above PR.

[codecov]

Codecov Report

Attention: Patch coverage is 46.51163% with 23 lines in your changes missing coverage. Please review.

Project coverage is 35.89%. Comparing base (46e4a67) to head (973a68b).
Report is 2 commits behind head on redesign-2024.

Files with missing lines	Patch %	Lines
.../cl/dtg/isaac/api/managers/UserAttemptManager.java	47.05%	7 Missing and 2 partials ⚠️
.../ac/cam/cl/dtg/isaac/api/managers/GameManager.java	20.00%	6 Missing and 2 partials ⚠️
...ac/cam/cl/dtg/isaac/dto/AssignmentProgressDTO.java	50.00%	4 Missing ⚠️
...ac/cam/cl/dtg/segue/api/managers/GroupManager.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           redesign-2024     #697      +/-   ##
=================================================
+ Coverage          35.87%   35.89%   +0.01%     
=================================================
  Files                528      528              
  Lines              23490    23500      +10     
  Branches            2851     2853       +2     
=================================================
+ Hits                8427     8435       +8     
  Misses             14201    14201              
- Partials             862      864       +2     

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