fix(TaxForms): add more fields for tax treaty

[Betree]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.62%. Comparing base (5ac5729) to head (43bf65c).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
server/lib/tax-forms/w8-ben-e.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1165      +/-   ##
==========================================
- Coverage   59.74%   59.62%   -0.12%     
==========================================
  Files          35       35              
  Lines        1006     1008       +2     
  Branches      342      342              
==========================================
  Hits          601      601              
- Misses        337      339       +2     
  Partials       68       68              

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