Minor ktdoc and code cleanup ahead of #2840

[gino-m]

Towards #2840

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 61.19%. Comparing base (ca9e4bd) to head (64b26a3).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...ndroid/ground/model/mutation/SubmissionMutation.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #2874   +/-   ##
=========================================
  Coverage     61.19%   61.19%           
- Complexity     1177     1178    +1     
=========================================
  Files           266      266           
  Lines          6345     6345           
  Branches        906      905    -1     
=========================================
  Hits           3883     3883           
  Misses         1933     1933           
  Partials        529      529           

Files with missing lines	Coverage Δ
...e/local/room/stores/RoomLocationOfInterestStore.kt	78.94% <ø> (ø)
...droid/ground/persistence/sync/MediaUploadWorker.kt	75.43% <100.00%> (+1.30%)	⬆️
...le/android/ground/repository/MutationRepository.kt	84.61% <100.00%> (ø)
...ogle/android/ground/ui/home/HomeScreenViewModel.kt	80.70% <ø> (ø)
...ndroid/ground/model/mutation/SubmissionMutation.kt	86.36% <0.00%> (-4.12%)	⬇️