style: Rename postProcessInput > postInputInitialization

[wrtobin]

Group API change to clarify function intent (no input parsing is done, the function is for initialization that takes place just after input parsing/processing has completed).

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 61.41079% with 93 lines in your changes missing coverage. Please review.

Project coverage is 55.88%. Comparing base (32b28b4) to head (68ea261).

Files	Patch %	Lines
...ultifluid/compositional/models/ModelParameters.hpp	0.00%	4 Missing :warning:
...uid/compositional/CompositionalMultiphaseFluid.cpp	0.00%	3 Missing :warning:
...omponents/constitutive/diffusion/DiffusionBase.cpp	0.00%	2 Missing :warning:
...ponents/constitutive/dispersion/DispersionBase.cpp	0.00%	2 Missing :warning:
...s/constitutive/fluid/singlefluid/ParticleFluid.cpp	0.00%	2 Missing :warning:
...nstitutive/fluid/singlefluid/ParticleFluidBase.cpp	0.00%	2 Missing :warning:
...titutive/fluid/singlefluid/ProppantSlurryFluid.cpp	0.00%	2 Missing :warning:
...constitutive/fluid/singlefluid/SlurryFluidBase.cpp	0.00%	2 Missing :warning:
...ability/VanGenuchtenStone2RelativePermeability.cpp	0.00%	2 Missing :warning:
...oreComponents/constitutive/solid/CeramicDamage.cpp	0.00%	2 Missing :warning:
... and 47 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #3198 +/- ## ======================================== Coverage 55.88% 55.88% ======================================== Files 1037 1037 Lines 88197 88197 ======================================== Hits 49288 49288 Misses 38909 38909 ```

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