[I] Remove the unused BackpressurePause [texera]

["aglinxinyuan (via GitHub)" <gi...@apache.org>]

aglinxinyuan opened a new issue, #8686:
URL: https://github.com/apache/texera/issues/8686

   ### Task Summary
   
   `BackpressurePause` is a `PauseType` that no production code passes to `PauseManager`.
   
   **Introduced by** #1636 (2022-08-20, "Introduce types of pause in Amber"). Backpressure paused the worker through `PauseManager` under its own pause type.
   
   **Usage removed by** #2237 (2023-12-02, "Use ActorMessage for flow control"). That PR deleted the `pauseManager.pause(BackpressurePause)` / `resume(BackpressurePause)` calls. Backpressure now arrives as an `ActorCommand` and flips `DPThread.backpressureStatus`, so it never goes through `PauseManager`.
   
   It has been dead for nearly three years. Only `PauseTypeSpec` and `WorkerManagersSpec` still reference it. #4533 removed its sibling `SchedulerTimeSlotExpiredPause` for the same reason.
   
   This is a pure deletion with no behaviour change: +11/−19 lines.
   
   ### Task Type
   
   - [x] Refactor / Cleanup
   


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Re: [I] Remove the unused BackpressurePause [texera]

["aglinxinyuan (via GitHub)" <gi...@apache.org>]

aglinxinyuan closed issue #8686: Remove the unused BackpressurePause
URL: https://github.com/apache/texera/issues/8686


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