fix: add fair queueing for celery

[thomasrockhu-codecov]

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Note

Medium Risk
Changes Celery worker runtime scheduling by enabling -Ofair, which can affect task ordering and throughput/latency under load. Scope is small and covered by updated unit tests verifying the CLI args passed to worker_main.

Overview
Enables Celery fair queueing for the worker process by adding the -Ofair option to the arguments passed into app.celery_app.worker_main.

Updates the worker CLI unit tests to expect the new flag across default, custom-queue, and no-queue/beat configurations.

^{Written by Cursor Bugbot for commit 52cf655. This will update automatically on new commits. Configure here.}

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.25%. Comparing base (5e5ae87) to head (52cf655).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #780   +/-   ##
=======================================
  Coverage   92.25%   92.25%           
=======================================
  Files        1305     1305           
  Lines       47981    47981           
  Branches     1636     1636           
=======================================
  Hits        44263    44263           
  Misses       3407     3407           
  Partials      311      311           

Flag	Coverage Δ
workerintegration	58.56% <ø> (ø)
workerunit	90.38% <ø> (ø)

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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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