Fix for 2D_CC boundary conditions

[jcapriot]

Takes the boundary condition into account when calculating the e and j fields for 2D cell_centered dc resistivity.
address #1033.

[codecov]

Codecov Report

Merging #1128 (570029f) into main (28f06ef) will decrease coverage by 9.38%.
The diff coverage is 100.00%.

❗ Current head 570029f differs from pull request most recent head f33d960. Consider uploading reports for the commit f33d960 to get more accurate results

@@            Coverage Diff             @@
##             main    #1128      +/-   ##
==========================================
- Coverage   79.59%   70.20%   -9.39%     
==========================================
  Files         137      137              
  Lines       20943    20955      +12     
==========================================
- Hits        16670    14712    -1958     
- Misses       4273     6243    +1970     

Impacted Files	Coverage Δ
...G/electromagnetics/static/resistivity/fields_2d.py	79.79% <100.00%> (+2.78%)	⬆️
SimPEG/dask/simulation.py	0.00% <0.00%> (-100.00%)	⬇️
...mPEG/dask/potential_fields/magnetics/simulation.py	0.00% <0.00%> (-94.45%)	⬇️
SimPEG/dask/potential_fields/gravity/simulation.py	0.00% <0.00%> (-92.86%)	⬇️
SimPEG/dask/potential_fields/base.py	0.00% <0.00%> (-90.91%)	⬇️
SimPEG/regularization/jtv.py	16.66% <0.00%> (-83.34%)	⬇️
SimPEG/regularization/cross_gradient.py	16.88% <0.00%> (-81.82%)	⬇️
.../electromagnetics/static/resistivity/simulation.py	0.00% <0.00%> (-78.27%)	⬇️
SimPEG/utils/io_utils/io_utils_pf.py	23.86% <0.00%> (-73.30%)	⬇️
SimPEG/dask/__init__.py	0.00% <0.00%> (-70.00%)	⬇️
... and 38 more

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