[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

Merging #21543 (7f48960) into master (428c18c) will increase coverage by 36.65%.
The diff coverage is 72.72%.

@@              Coverage Diff              @@
##             master   #21543       +/-   ##
=============================================
+ Coverage     36.57%   73.23%   +36.65%     
- Complexity    12205    32673    +20468     
=============================================
  Files          1715     1892      +177     
  Lines        131092   140702     +9610     
  Branches      14300    15478     +1178     
=============================================
+ Hits          47952   103047    +55095     
+ Misses        76759    29545    -47214     
- Partials       6381     8110     +1729     

Flag	Coverage Δ
inttests	24.08% <0.00%> (-0.14%)	⬇️
systests	24.64% <0.00%> (-0.03%)	⬇️
unittests	72.54% <72.72%> (+40.81%)	⬆️

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

Files	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 1456 files with indirect coverage changes

[tisonkun]

Thank you!