Feat: Enable Sentry CeleryIntegration in worker init

[vprashrex]

Summary

Target issue is #PLEASE_TYPE_ISSUE_NUMBER
Explain the motivation for making this change. What existing problem does the pull request solve?

Enable Sentry's CeleryIntegration in Celery worker observability init so Celery task errors and performance data flow to Sentry. Previously the integration was explicitly disabled, which suppressed Celery-level instrumentation.

Configured with:

• propagate_traces=False — avoid linking unrelated task chains into single traces.
• monitor_beat_tasks=False — skip Beat cron monitor checkins (not used).

Removed CeleryIntegration() from disabled_integrations since it is now active.

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

Notes

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📥 Commits

Reviewing files that changed from the base of the PR and between e8d87ff and 745b4b7.

📒 Files selected for processing (1)

• backend/app/celery/celery_app.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/enable-sentry-celery-integration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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