feat: DIA-1926: return annots/preds in sample data

[pakelley]

This PR was automatically generated via Follow Merge. Workflow Run
Please ensure that all linked upstream Pull Requests are merged before proceeding with this one.

• feat: DIA-1926: add generate_complete_sample_task function label-studio-sdk#427

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Adds sample annotations/predictions to sample task, when it can.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.30%. Comparing base (4108f9e) to head (5d1adb8).
Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7178      +/-   ##
===========================================
+ Coverage    77.20%   77.30%   +0.09%     
===========================================
  Files          187      188       +1     
  Lines        14484    14549      +65     
===========================================
+ Hits         11183    11247      +64     
- Misses        3301     3302       +1     

Flag	Coverage Δ
pytests	77.30% <100.00%> (+0.09%)	⬆️

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[matt-bernstein]

Have you checked that this doesn't cause regressions or perf issues for when this endpoint is used to populate the label interface preview? I was imagining to have some kind of use_v2: bool = False param in the endpoint that would isolate it to only the new widget by default. If it just works for everything, then amazing, just gotta call out the extr test surface for QA