fix: support Redis Cluster for BullMQ jobs

[xernobyl]

What does this PR do?

Fixes the BullMQ response pipeline enqueue failure on Redis Cluster.

Staging Redis runs as a Redis Cluster, and BullMQ uses Lua scripts that touch multiple queue keys in one operation. With the old prefix (formbricks:jobs), BullMQ keys could land in different Redis hash slots, causing CROSSSLOT Keys in request don't hash to the same slot when enqueueResponsePipelineJob tried to add a job.

This PR updates the shared BullMQ jobs prefix to {formbricks:jobs} so Redis Cluster hashes all queue keys to the same slot. It also adds a regression test and documents the prefix requirement in the background job handbook.

Fixes #(issue)

How should this be tested?

• Run pnpm --filter @formbricks/jobs test
• Run pnpm --filter @formbricks/logger build
• Run pnpm --filter @formbricks/jobs build
• Optional staging verification: submit a survey response with Redis Cluster enabled and confirm the response pipeline job enqueues without a CROSSSLOT error.

Checklist

Required

• Filled out the "How to test" section in this PR
• Read How we Code at Formbricks
• Self-reviewed my own code
• Commented on my code in hard-to-understand bits
• Ran pnpm build
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues
• First PR at Formbricks? Please sign the CLA! Without it we wont be able to merge it 🙏

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR
• Updated the Formbricks Docs if changes were necessary

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 41f3344b-4eaf-4f1f-880a-78cce0a9b993

📥 Commits

Reviewing files that changed from the base of the PR and between 550bfc6 and d845894.

📒 Files selected for processing (2)

• packages/jobs/src/constants.ts
• packages/jobs/src/queue.test.ts

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Walkthrough

This PR updates the BullMQ jobs queue Redis key prefix from a plain string "formbricks:jobs" to a hash-tagged format "{formbricks:jobs}". Hash-tagging is a Redis Cluster pattern that ensures related keys hash to the same slot for cluster-safe operations. The change modifies the exported JOBS_PREFIX constant and adds a corresponding test assertion to verify the new prefix value.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding Redis Cluster support to BullMQ jobs through a prefix update.
Description check	✅ Passed	The description includes all required template sections: a detailed explanation of what the PR does, specific testing instructions, and a completed checklist with most required items checked.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud