Simplify signature UIImage export

[philippzagar]

Simplify signature UIImage export

♻️ Current situation & Problem

The current signature export logic manually reads all strokes from the drawing and sets them to black before converting to an UI image. This can be done simpler via .withRenderingMode(.alwaysTemplate).withTintColor(.black)

⚙️ Release Notes

• Simplify signature UIImage export
• Fixed LFS consent document files in unit tests

📚 Documentation

Updated doc

✅ Testing

Tested locally

📝 Code of Conduct & Contributing Guidelines

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• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.56%. Comparing base (a7cc789) to head (d5b1653).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #66      +/-   ##
==========================================
- Coverage   73.80%   73.56%   -0.23%     
==========================================
  Files          24       24              
  Lines        1328     1316      -12     
==========================================
- Hits          980      968      -12     
  Misses        348      348              

Files with missing lines	Coverage Δ
...arding/Consent/Export/ConsentDocument+Export.swift	74.08% <100.00%> (-8.42%)	⬇️
...t/ConsentDocumentExportRepresentation+Render.swift	99.11% <100.00%> (+0.01%)	⬆️

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