perf(worker): Optimize test analytics flake processing DB queries

[sentry]

Fixes WORKER-Y7W. The issue was that: Iterating through uploads and fetching testruns individually for each upload causes N+1 queries to the ta_timeseries database.

• Refactored get_testruns to fetch testruns for multiple uploads in a single database query.
• Modified process_single_upload to accept pre-fetched testruns, eliminating per-upload database calls.
• Updated process_flakes_for_commit to batch fetch and group testruns by upload, significantly reducing database query count.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 13355253

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Note

Low Risk
Low risk performance refactor that changes how Testrun rows are fetched and grouped; main risk is subtle behavioral differences if upload ordering/empty-upload cases are mishandled.

Overview
Optimizes flake processing to avoid N+1 DB queries. get_testruns now accepts multiple upload_ids and process_flakes_for_commit prefetches all recent Testruns in a single query, groups them by upload_id, and passes those lists into process_single_upload.

process_single_upload no longer queries per upload and instead operates on the provided pre-fetched testruns, keeping the existing outcome updates via bulk_update.

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[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.25%. Comparing base (9eed0bb) to head (7fd3d25).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #827   +/-   ##
=======================================
  Coverage   92.25%   92.25%           
=======================================
  Files        1306     1306           
  Lines       48012    48016    +4     
  Branches     1636     1636           
=======================================
+ Hits        44294    44298    +4     
  Misses       3407     3407           
  Partials      311      311           

Flag	Coverage Δ
workerintegration	58.53% <22.22%> (-0.01%)	⬇️
workerunit	90.39% <100.00%> (+<0.01%)	⬆️

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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