FIX: design type check and update points cloud extension call

[eblanco-ansys]

Update the design type check to include "Maxwell 2D" and modify the points cloud extension call to use a the new extension data class

[gmalinve]

LGTM, Thanks very much!!!

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.22%. Comparing base (0a75871) to head (208d608).
⚠️ Report is 2 commits behind head on main.

❌ Your patch status has failed because the patch coverage (25.00%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6750      +/-   ##
==========================================
- Coverage   83.23%   83.22%   -0.01%     
==========================================
  Files         245      245              
  Lines       77361    77363       +2     
==========================================
- Hits        64389    64387       -2     
- Misses      12972    12976       +4     

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