[Hotfix] Fix unit test issues

[zhoujinsong]

Why are the changes needed?

Tried to fix unit test issues in :https://github.com/apache/amoro/actions/runs/12308627468/job/34358691837

Brief change log

• Clear derby tables after TestIcebergServerTableDescriptor execution

How was this patch tested?

• Add some test cases that check the changes thoroughly including negative and positive cases if possible

• Add screenshots for manual tests if appropriate

• Run test locally before making a pull request

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.62%. Comparing base (243d289) to head (07bd379).
Report is 14 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3373      +/-   ##
============================================
+ Coverage     21.59%   21.62%   +0.03%     
- Complexity     2309     2313       +4     
============================================
  Files           426      426              
  Lines         39719    39724       +5     
  Branches       5624     5623       -1     
============================================
+ Hits           8577     8591      +14     
+ Misses        30414    30406       -8     
+ Partials        728      727       -1     

Flag	Coverage Δ
trino	21.62% <ø> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[zhoujinsong]

@klion26 Can you help to check this PR?

[klion26]

Thanks for the contribution. LGTM