Remove specific test using 'tbb::spin_mutex'

[grospelliergilles]

This class is no longer used in Arcane.

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.30%. Comparing base (a185294) to head (d6bc1e3).
Report is 3 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
arcane/src/arcane/tests/TaskUnitTest.cc	95.83%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1876      +/-   ##
==========================================
+ Coverage   70.28%   70.30%   +0.01%     
==========================================
  Files        2275     2275              
  Lines      163762   163758       -4     
  Branches    18863    18862       -1     
==========================================
+ Hits       115102   115128      +26     
+ Misses      41831    41805      -26     
+ Partials     6829     6825       -4     

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