refactor: cleanup setMGRStrategy a bit

[paveltomin]

this is reopened #3386
waiting for #3339 be merged first

[paveltomin]

@victorapm this lost your review because of merging/reopening
could you please have another look?

[victorapm]

Looks good, thanks!

[paveltomin]

@CusiniM, @Guotong-Ren, @castelletto1, @frankfeifan, @jhuang2601, @matteofrigo5, @rrsettgast, and/or @ryar9534 need your reviews, Victor already approved

[paveltomin]

@CusiniM, @Guotong-Ren, @castelletto1, @frankfeifan, @jhuang2601, @matteofrigo5, @rrsettgast, and/or @ryar9534 please review

[paveltomin]

@CusiniM, @castelletto1, @frankfeifan, @jhuang2601, @rrsettgast, and/or @ryar9534 please review, it's a simple clean up PR, nothing major

[codecov]

Codecov Report

Attention: Patch coverage is 6.75676% with 138 lines in your changes missing coverage. Please review.

Project coverage is 56.84%. Comparing base (b5ea7ce) to head (ba14408).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...sSolvers/multiphysics/SinglePhasePoromechanics.cpp	0.00%	17 Missing ⚠️
...vers/multiphysics/SinglePhaseReservoirAndWells.cpp	15.78%	16 Missing ⚠️
...csSolvers/multiphysics/MultiphasePoromechanics.cpp	0.00%	15 Missing ⚠️
...olvers/contact/SolidMechanicsEmbeddedFractures.cpp	0.00%	14 Missing ⚠️
...ysics/CompositionalMultiphaseReservoirAndWells.cpp	17.64%	14 Missing ⚠️
...sSolvers/contact/SolidMechanicsLagrangeContact.cpp	0.00%	13 Missing ⚠️
...hysicsSolvers/multiphysics/HydrofractureSolver.cpp	0.00%	10 Missing ⚠️
...cs/SinglePhasePoromechanicsConformingFractures.cpp	0.00%	9 Missing ⚠️
...sics/SinglePhasePoromechanicsEmbeddedFractures.cpp	0.00%	9 Missing ⚠️
...vers/multiphysics/CoupledReservoirAndWellsBase.hpp	44.44%	5 Missing ⚠️
... and 4 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3422      +/-   ##
===========================================
- Coverage    56.89%   56.84%   -0.06%     
===========================================
  Files         1154     1154              
  Lines        99878    99954      +76     
===========================================
- Hits         56828    56818      -10     
- Misses       43050    43136      +86     

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