fixes for regional decomposition test

[junwang-noaa]

Description

Some fixes are made to dycore to resolve the issue with the regional decomposition reproducibility.

Issue(s) addressed

Link the issues to be closed with this PR, whether in this repository, or in another repository.
(Remember, issues should always be created before starting work on a PR branch!)

• fixes Some different MPI layouts in regional does not reproduce results ufs-community/ufs-weather-model#649

Testing

How were these changes tested?
on hera
What compilers / HPCs was it tested with?
Intel.
Are the changes covered by regression tests? (If not, why? Do new tests need to be added?)
Yes. Different decompositions have been tested with regional_3km test.
Have the ufs-weather-model regression test been run? On what platform?
Yes.

• Will the code updates change regression test baseline? If yes, why? Please show the baseline directory below.
  The regional test baseline will change due to the fix.
• Please commit the regression test log files in your ufs-weather-model branch

Dependencies

If testing this branch requires non-default branches in other repositories, list them.
Those branches should have matching names (ideally)

• Regional decomposition test fix (when nrows_blend > 0) NOAA-GFDL/GFDL_atmos_cubed_sphere#194

[SamuelTrahanNOAA]

This has been merged into #553

[junwang-noaa]

Merged through #553.