perf(worker): Batch testrun fetching for flake processing

[sentry]

Fixes WORKER-Y7M. The issue was that: Looping through uploads causes N+1 queries to fetch and update testruns in the ta_timeseries database.

• Refactored process_flakes_for_commit to fetch all relevant testruns for a commit's uploads in a single query.
• Updated get_testruns to accept a list of upload IDs, enabling batch fetching.
• Removed the process_single_upload helper function, integrating its logic directly into process_flakes_for_commit.
• Reduced the number of database queries during flake processing, improving efficiency.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 13327093

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Note

Low Risk
Primarily a performance refactor that changes query shape (single upload_id__in fetch + bulk update) but keeps the same outcome-handling logic; risk is limited to potential edge cases when upload_ids is empty or large.

Overview
Batches flake processing per commit to avoid N+1 DB queries. process_flakes_for_commit now fetches all relevant uploads up front, then pulls all recent Testruns for those upload_ids in a single query and performs one bulk_update.

Removes the per-upload process_single_upload helper and updates get_testruns to accept a list of upload IDs, while preserving the existing pass/fail handling and flaky_fail outcome normalization.

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[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.25%. Comparing base (8c332b1) to head (a4bfec0).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #816      +/-   ##
==========================================
- Coverage   92.25%   92.25%   -0.01%     
==========================================
  Files        1306     1306              
  Lines       48004    47999       -5     
  Branches     1636     1636              
==========================================
- Hits        44286    44281       -5     
  Misses       3407     3407              
  Partials      311      311              

Flag	Coverage Δ
workerintegration	58.58% <6.25%> (+<0.01%)	⬆️
workerunit	90.38% <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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