logpuller: extract generic priority queue (#5487)

[ti-chi-bot]

This is an automated cherry-pick of #5487

What problem does this PR solve?

Issue Number: close #5488

What is changed and how it works?

This pull request refactors the priority queue used in the log service into a generic utility package. By moving this logic to utils/priorityqueue, the codebase reduces duplication and provides a more robust, thread-safe implementation that can be leveraged by other components. The changes include updating existing consumers to use the new generic queue and ensuring proper error handling during queue closure.

Highlights

• Refactoring Priority Queue: Extracted the priority queue implementation from logservice/logpuller into a generic, reusable utils/priorityqueue package.
• Improved Queue API: Updated the priority queue to support generic types and improved the blocking Pop mechanism with proper ErrClosed handling.
• Code Cleanup: Removed the redundant local PriorityQueue implementation in logservice/logpuller and updated all references to use the new utility.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

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Summary by CodeRabbit

• Refactor
  • Consolidated custom priority queue into a reusable generic utility package.
  • Updated region task queue to use the new utility.
  • Added test coverage for priority ordering verification.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lidezhu

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