fix(backend): log failedReason when connection sync job fails

[brendan-kellam]

Summary

• When a connection sync job fails, the actual error reason (job.failedReason) was stored in the DB but never printed to the logs
• Users saw only a generic "Failed job ... Failing job." message with no diagnostic information, even with SOURCEBOT_LOG_LEVEL=debug

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Connection sync job failures now log the actual error reason instead of a generic message, providing better visibility for troubleshooting failed connections.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7da5a85f-4344-4549-aef2-ed57146bd14b

📥 Commits

Reviewing files that changed from the base of the PR and between ca63bf2 and 5c03e83.

📒 Files selected for processing (2)

• CHANGELOG.md
• packages/backend/src/connectionManager.ts

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Walkthrough

This PR enhances error logging for failed connection sync jobs by capturing and displaying the actual failure reason instead of a generic message. Changes include updating the logging statement in the connection manager and documenting this fix in the changelog.

Changes

Cohort / File(s)	Summary
Connection Sync Job Failure Logging CHANGELOG.md, packages/backend/src/connectionManager.ts	Updated onJobMaybeFailed to log job failure reason via job.failedReason and added corresponding changelog entry documenting the fix.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• chore(worker): add PostHog events for repo index sync jobs #878: Modifies connection sync failure handling in packages/backend/src/connectionManager.ts to add connection extraction and telemetry tracking for failures; complements this PR's logging improvements.

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch brendan/fix-connection-sync-failed-reason-logging

📝 Coding Plan

• Generate coding plan for human review comments

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