Fix IT log directory test class names

[Caideyipi]

Summary

• Pass IT class names from IoTDB test runners into environments explicitly.
• Use the explicit class name for cluster node log directory names, with stack inference kept as a fallback.
• Propagate class names for multi-cluster and parameterized IT runners to avoid UNKNOWN-IT log buckets.

Tests

• mvn spotless:apply -pl integration-test -P with-integration-tests
• mvn -pl integration-test -P with-integration-tests -DskipTests test-compile
• git diff --check

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% 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 41.85%. Comparing base (bd49457) to head (de9d9f6).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##             master   #18131    +/-   ##
==========================================
  Coverage     41.84%   41.85%            
  Complexity      318      318            
==========================================
  Files          5296     5297     +1     
  Lines        373604   373974   +370     
  Branches      48232    48270    +38     
==========================================
+ Hits         156351   156537   +186     
- Misses       217253   217437   +184     

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