[Caideyipi]

WALNodeTest#testDeleteOutdatedFiles still references walFlushListeners after #17921 removed the list and its collection code, preventing DataNode test compilation on master.

Remove the obsolete listener loop. The explicit walNode.rollWALFile() already waits for its roll listener; the WAL-consumption wait and file-existence/deletion assertions remain in place.

Validation:

• mvn spotless:apply -P with-integration-tests -pl iotdb-core/datanode -o passed.
• git diff --check passed.
• Checked the synchronous WALNode#rollWALFile implementation and the remaining listener references.
• Maven test compilation and WAL tests were not rerun for this deletion-only change.

[sonarqubecloud]

Quality Gate passed

Issues
20 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.8% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.80%. Comparing base (db0a9b4) to head (defd9ae).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #19189      +/-   ##
============================================
+ Coverage     48.78%   48.80%   +0.01%     
  Complexity      674      674              
============================================
  Files          5574     5574              
  Lines        412528   412785     +257     
  Branches      54404    54441      +37     
============================================
+ Hits         201270   201459     +189     
- Misses       211258   211326      +68     

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