Observability: make celery telemetry init pool-agnostic and drop non-app traces

[vprashrex]

Summary

Traceability for llm-call gets truncated in celery because of pool is gevent. Now this fix made the traceability pool agonistic

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.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 717dbda3-1e03-4a76-a70a-9fc39b4814c2

📥 Commits

Reviewing files that changed from the base of the PR and between 0220157 and 6d35094.

📒 Files selected for processing (2)

• backend/app/celery/celery_app.py
• backend/app/core/sentry_filters.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch hotfix/sentry-observability

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[codecov]

Codecov Report

❌ Patch coverage is 19.60784% with 41 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
backend/app/core/sentry_filters.py	16.00%	21 Missing ⚠️
backend/app/celery/celery_app.py	23.07%	20 Missing ⚠️

📢 Thoughts on this report? Let us know!