Fix compaction test metadata lease cleanup

[shuwenwei]

Summary

• Preserve the original metadata lease fence timeout in AbstractCompactionTest.
• Restore the timeout and reset the metadata lease state during teardown.

Motivation

Compaction unit tests temporarily keep the metadata lease available to avoid fenced local metadata cache failures. Without symmetric teardown cleanup, the global lease timeout and lease state can leak across tests and cause unrelated failures.

[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 42.04%. Comparing base (c716365) to head (a3c1cab).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #18172   +/-   ##
=========================================
  Coverage     42.04%   42.04%           
  Complexity      318      318           
=========================================
  Files          5312     5312           
  Lines        375102   375102           
  Branches      48422    48422           
=========================================
+ Hits         157693   157696    +3     
+ Misses       217409   217406    -3     

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.