perf(worker): Eagerly load related objects for flake processing

[sentry]

Fixes WORKER-Y7J. The issue was that: get_relevant_uploads lacks select_related for ReportSession's foreign keys, causing N+1 queries when iterating uploads.

• Adds select_related to the TestInstance query in ta_process_flakes.py.
• Eagerly loads report, report__commit, report__commit__repository, and report__commit__repository__author.
• Optimizes database queries by preventing N+1 issues when accessing related objects during flake processing.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 13317433

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Note

Low Risk
Low risk performance-only change that adjusts a queryset to eager-load related ReportSession foreign keys; main risk is unexpected query shape/memory increase on very large result sets.

Overview
Reduces N+1 database queries during flake processing by updating get_relevant_uploads in ta_process_flakes.py to select_related the ReportSession's report -> commit -> repository -> author chain when fetching uploads for a commit.

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[codecov-notifications]

Codecov Report

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

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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 (1e7828c).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #814   +/-   ##
=======================================
  Coverage   92.25%   92.25%           
=======================================
  Files        1306     1306           
  Lines       48004    48004           
  Branches     1636     1636           
=======================================
  Hits        44286    44286           
  Misses       3407     3407           
  Partials      311      311           

Flag	Coverage Δ
workerintegration	58.58% <ø> (ø)
workerunit	90.38% <ø> (ø)

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