[fix][test] Fix multiple thread leaks in tests, part 3

[lhotari]

Motivation

There are thread leaks in tests reported by the thread leak detection added in #21450.

Modifications

Fix multiple thread leaks in unit tests.

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

[codecov-commenter]

Codecov Report

❌ Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.23%. Comparing base (428c18c) to head (7f48960).
⚠️ Report is 1523 commits behind head on master.

Files with missing lines	Patch %	Lines
...ker/authentication/AuthenticationProviderSasl.java	66.66%	0 Missing and 1 partial ⚠️
...rg/apache/pulsar/common/sasl/TGTRefreshThread.java	0.00%	0 Missing and 1 partial ⚠️
...esystem/impl/FileSystemManagedLedgerOffloader.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #21543       +/-   ##
=============================================
+ Coverage     36.62%   73.23%   +36.61%     
- Complexity    12205    32673    +20468     
=============================================
  Files          1715     1892      +177     
  Lines        131092   140702     +9610     
  Branches      14300    15478     +1178     
=============================================
+ Hits          48015   103047    +55032     
+ Misses        76707    29545    -47162     
- Partials       6370     8110     +1740     

Flag	Coverage Δ
inttests	24.08% <0.00%> (-0.14%)	⬇️
systests	24.64% <0.00%> (-0.15%)	⬇️
unittests	72.54% <72.72%> (+40.81%)	⬆️

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

Files with missing lines	Coverage Δ
...he/pulsar/client/impl/auth/AuthenticationSasl.java	69.50% <100.00%> (+69.50%)	⬆️
...ker/authentication/AuthenticationProviderSasl.java	59.23% <66.66%> (+59.23%)	⬆️
...rg/apache/pulsar/common/sasl/TGTRefreshThread.java	25.92% <0.00%> (+25.92%)	⬆️
...esystem/impl/FileSystemManagedLedgerOffloader.java	69.38% <50.00%> (ø)

... and 1455 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[tisonkun]

Thank you!