Add override of 'IMemoryAllocator::memoryResource()' for accelerator allocators

[grospelliergilles]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 70.26%. Comparing base (9055f31) to head (1bbc84c).
Report is 2 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
arcane/src/arcane/accelerator/tests/TestInit.cc	12.50%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1807      +/-   ##
==========================================
- Coverage   70.26%   70.26%   -0.01%     
==========================================
  Files        2261     2261              
  Lines      162441   162449       +8     
  Branches    18705    18706       +1     
==========================================
- Hits       114146   114140       -6     
- Misses      41524    41535      +11     
- Partials     6771     6774       +3     

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