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

[sentry]

This PR addresses an N+1 query performance issue within the ProcessFlakesTask by refactoring the ta_process_flakes.py module.

Previously, the process_flakes_for_commit function iterated over each ReportSession (upload) for a given commit, calling process_single_upload for each. This resulted in an N+1 query pattern where Testrun objects were fetched and updated individually for every upload (one SELECT and one UPDATE per upload).

The fix consolidates these database operations:

• get_testruns now accepts a list of upload_ids, allowing all relevant testruns across multiple uploads to be fetched in a single SELECT query.
• The logic from process_single_upload has been integrated into a new process_all_uploads function, which processes all testruns for all uploads in a single pass.
• The Testrun.objects.bulk_update call is now performed once after all testruns have been processed, resulting in a single UPDATE query.

This change significantly reduces the number of database queries, improving the performance of the ProcessFlakesTask by transforming N SELECTs + N UPDATEs into 1 SELECT + 1 UPDATE.

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Fixes WORKER-YTB

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.89%. Comparing base (7b60783) to head (cdc0456).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1207      +/-   ##
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- Coverage   91.89%   91.89%   -0.01%     
==========================================
  Files        1325     1325              
  Lines       50862    50860       -2     
  Branches     1626     1626              
==========================================
- Hits        46741    46739       -2     
  Misses       3815     3815              
  Partials      306      306              

Flag	Coverage Δ
workerintegration	58.57% <40.00%> (+<0.01%)	⬆️
workerunit	90.37% <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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