perf(worker): Batch testrun processing for flake detection

[sentry]

Fixes WORKER-Y96. The issue was that: The process_flakes_for_commit function executes N+1 queries by fetching Testrun objects individually for each ReportSession within a loop.

• Refactored flake processing to fetch all relevant testruns for a commit's uploads in a single batch.
• Renamed get_testruns to get_testruns_for_uploads and updated it to accept a list of upload IDs.
• Removed the process_single_upload function.
• Consolidated Testrun.objects.bulk_update to a single call after processing all testruns, improving efficiency.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 13573082

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Note

Medium Risk
Moderate risk: changes the query shape and batching behavior for Testrun updates, which could impact performance/memory on large commits and alter which rows get updated if upload lists are empty or large.

Overview
Refactors flake detection to batch-fetch all Testruns for a commit’s relevant uploads (via get_testruns_for_uploads(upload_ids)) instead of querying per-upload, eliminating the prior N+1 pattern.

Processing is consolidated into a single loop over the combined testruns with one bulk_update at the end, and the per-upload helper (process_single_upload) is removed; logging now records upload_ids rather than upload objects.

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[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.25%. Comparing base (0ad8a0c) to head (1630373).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #873      +/-   ##
==========================================
- Coverage   92.25%   92.25%   -0.01%     
==========================================
  Files        1307     1307              
  Lines       48017    48011       -6     
  Branches     1636     1636              
==========================================
- Hits        44299    44293       -6     
  Misses       3407     3407              
  Partials      311      311              

Flag	Coverage Δ
workerintegration	58.55% <6.66%> (+<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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