Fix mpi communicator access in Hypre matrix, vector and solver.

[stdcm]

• Use IMessagePassingMng::communicator instead of a cast into MpiMessagePassingMng which only exists in standalone mode

[codecov]

Codecov Report

Attention: Patch coverage is 41.17647% with 10 lines in your changes missing coverage. Please review.

Project coverage is 69.66%. Comparing base (85386ae) to head (fdb4983).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
.../alien/kernels/hypre/data_structure/HypreMatrix.cc	33.33%	3 Missing and 1 partial ⚠️
.../alien/kernels/hypre/data_structure/HypreVector.cc	42.85%	3 Missing and 1 partial ⚠️
...s/hypre/linear_solver/HypreInternalLinearSolver.cc	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1657      +/-   ##
==========================================
- Coverage   69.66%   69.66%   -0.01%     
==========================================
  Files        2247     2247              
  Lines      160467   160476       +9     
  Branches    18486    18486              
==========================================
+ Hits       111794   111796       +2     
- Misses      42018    42021       +3     
- Partials     6655     6659       +4     

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