Fix WAL roll file test flush wait

[Caideyipi]

Wait for the WALFlushListener returned by WAL writes instead of polling WAL buffer internal consumed state. Tests: mvn -Ddevelocity.off=true spotless:check -pl iotdb-core/datanode

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.85%. Comparing base (f2dd701) to head (5b8bbd0).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17904      +/-   ##
============================================
+ Coverage     42.71%   42.85%   +0.13%     
  Complexity      343      343              
============================================
  Files          5356     5356              
  Lines        380693   380712      +19     
  Branches      49415    49416       +1     
============================================
+ Hits         162632   163157     +525     
+ Misses       218061   217555     -506     

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[Caideyipi]

Updated this PR onto the latest master (dc47a3b). The reported timeout occurs while polling WALBuffer.isAllWALEntriesConsumed() before the actual waitForNextReady assertion. The test now waits on the WALFlushListener returned by each write, which synchronizes on the completed flush without depending on the buffer's transient internal state. Spotless check passes locally; CI has been re-triggered.

[sonarqubecloud]

Quality Gate failed

Failed conditions
B Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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