fix(worker): Resolve N+1 query in ProcessFlakesTask

[sentry]

An N+1 query was identified in app.tasks.flakes.ProcessFlakesTask, specifically within the process_flakes_for_commit function. The original implementation iterated over each upload and, for each, called process_single_upload. Inside process_single_upload, a separate database query was executed to fetch Testrun objects for that specific upload. This resulted in an N+1 query pattern (1 query for uploads + N queries for testruns).

Additionally, Testrun.objects.bulk_update was being called inside the loop for each upload, leading to N separate update operations.

This fix addresses the N+1 query by:

• Introducing get_testruns_for_uploads to batch-fetch all relevant Testrun objects for all uploads in a single database query.
• Modifying process_single_upload to accept pre-fetched Testrun objects, eliminating the need for per-upload database queries.
• Consolidating Testrun.objects.bulk_update into a single call after all uploads have been processed, further optimizing database interactions.

These changes significantly reduce the number of database queries and improve the performance of the ProcessFlakesTask.

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Fixes WORKER-YTG

[codecov]

Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.89%. Comparing base (7b60783) to head (59528bf).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...orker/services/test_analytics/ta_process_flakes.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1212      +/-   ##
==========================================
- Coverage   91.89%   91.89%   -0.01%     
==========================================
  Files        1325     1325              
  Lines       50862    50874      +12     
  Branches     1626     1626              
==========================================
+ Hits        46741    46750       +9     
- Misses       3815     3818       +3     
  Partials      306      306              

Flag	Coverage Δ
workerintegration	58.52% <6.25%> (-0.04%)	⬇️
workerunit	90.36% <93.75%> (-0.02%)	⬇️

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[codecov-notifications]

Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...orker/services/test_analytics/ta_process_flakes.py	93.75%	1 Missing ⚠️

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