chore: explicitly close the vector after finish the processing

[bednar]

Proposed Changes

This pull request refactors the query methods in InfluxDBClientImpl.java to reduce code duplication when processing query responses into custom data objects.

The most significant change is the explicit closing of the VectorSchemaRoot by onClose(vector::close). Although VectorSchemaRoot is automatically released by the FlightSqlClient, we now close it explicitly to add an extra layer of safety and ensure that all resources are properly freed.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.78%. Comparing base (7692c3b) to head (5f74725).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
- Coverage   86.83%   86.78%   -0.06%     
==========================================
  Files          20       20              
  Lines        1299     1294       -5     
  Branches      215      215              
==========================================
- Hits         1128     1123       -5     
  Misses         81       81              
  Partials       90       90              

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[jansimonb]

LGTM 👍