[PR] [ISSUE #11013] Stop timer WAL scheduler during RocksDB shutdown [rocketmq]

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

zjncs opened a new pull request, #11019:
URL: https://github.com/apache/rocketmq/pull/11019

   ## Which Issue(s) This PR Fixes
   
   Fixes #11013
   
   ## Brief Description
   
   `MessageRocksDBStorage.postLoad()` schedules a periodic timer-WAL flush, but `preShutdown()` leaves the executor and task running. Reloading the RocksDB storage schedules another task on every cycle, and the non-daemon scheduler survives after RocksDB resources close.
   
   This change stops the scheduler during shutdown and recreates it before a subsequent load, preventing duplicate flush tasks while preserving reload support.
   
   ## How Did You Test This Change?
   
   - Base SHA: `$(git rev-parse develop)`
   - Confirmed current `MessageRocksDBStorage` schedules in `postLoad()` and had an empty `preShutdown()`.
   - `git diff --check` passed.
   - Maven is unavailable in this environment, so the required test suite was not run; CI should validate.
   
   ## Risk
   
   Low; scheduler lifecycle now follows storage lifecycle, and reload recreates the executor before rescheduling.
   
   AI-assisted contribution; implementation and verification performed against current `develop`.


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