FIX: adding missing argument for 2d electrostatic balloon BC

[anur7]

Description

In Maxwell Electrostatic solver, balloon boundary condition has 2 types: voltage and charge. In this PR an argument is added in assign_balloon() to set voltage or charge boundary condition type.

Issue linked

Issue #5991

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.06%. Comparing base (824117f) to head (bab7b8b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6011      +/-   ##
==========================================
+ Coverage   82.36%   85.06%   +2.70%     
==========================================
  Files         166      166              
  Lines       62978    62980       +2     
==========================================
+ Hits        51870    53574    +1704     
+ Misses      11108     9406    -1702     

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[gmalinve]

@anur7 well done! you still need to fix a couple of things though ;)

[gmalinve]

LGTM, good job!

[Samuelopez-ansys]

LGTM. Thanks @anur7 !