[fix][test] Fix thread leak in concurrent collections tests

[lhotari]

Motivation

Concurrent collections tests continue to leak threads.

Modifications

• replace while (true) with while (!Thread.currentThread().isInterrupted()) so that the thread has a chance to exit when the thread pool is shutdown.

Documentation

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

[codecov-commenter]

Codecov Report

Merging #21449 (09d0426) into master (2b5c199) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master   #21449      +/-   ##
============================================
- Coverage     73.31%   73.28%   -0.04%     
- Complexity    32599    32606       +7     
============================================
  Files          1890     1890              
  Lines        140357   140357              
  Branches      15425    15425              
============================================
- Hits         102903   102856      -47     
- Misses        29361    29416      +55     
+ Partials       8093     8085       -8     

Flag	Coverage Δ
inttests	24.29% <ø> (+0.06%)	⬆️
systests	24.82% <ø> (+0.03%)	⬆️
unittests	72.58% <ø> (-0.02%)	⬇️

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

see 76 files with indirect coverage changes