fix(run-queue): Scan for queues using a duplicate redis client instead of the instance version

[ericallam]

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Latest commit: 748d74f17891c0e477d7f34e42141c2828aa47fd

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[coderabbitai[bot]]

Walkthrough

The change replaces scan operations to use a duplicated Redis connection (redis.duplicate()) instead of the primary client within concurrency-related streams. currentConcurrencyScanStream and processConcurrencySet now create a duplicate, use it to drive scanStream/sscanStream, and return the stream along with the duplicate Redis instance. After scanning completes (or on error), the duplicate connection is closed via redis.quit(). Error handling is added around scan operations, capturing scanError and logging failures in both scanConcurrencySets and processConcurrencySet. These updates are internal; no exported/public API signatures were changed.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

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