logpuller: make region request worker lifecycle explicit

[lidezhu]

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Code Review

This pull request refactors the region request and subscription lifecycle management in the logpuller service. It replaces the old channel-based requestCache and manual state-tracking map in regionRequestWorker with a simplified requestCache (using a new notifyqueue.Queue utility) and a dedicated regionTracker. Additionally, subscription deregistration is now broadcasted directly to workers' control queues rather than being routed through the main region task queue. There are no review comments provided, so I have no feedback to evaluate.

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