feat(SPV-815): refactor how the outputs in draft transaction are created

[pawellewandowski98]

Pull Request Checklist

• 📖 I created my PR using provided : CODE_STANDARDS
• 📖 I have read the short Code of Conduct: CODE_OF_CONDUCT
• 🏠 I tested my changes locally.
• ✅ I have provided tests for my changes.
• 📝 I have used conventional commits.
• 📗 I have updated any related documentation.
• 💾 PR was issued based on the Github or Jira issue.

[github-actions]

Manual Tests

💚 Manual testing by @chris-4chain resulted in success.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 66.66667% with 35 lines in your changes missing coverage. Please review.

Project coverage is 48.91%. Comparing base (a53cf1e) to head (6c66ecd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #608      +/-   ##
==========================================
+ Coverage   48.86%   48.91%   +0.04%     
==========================================
  Files         259      259              
  Lines       12137    12160      +23     
==========================================
+ Hits         5931     5948      +17     
- Misses       5612     5616       +4     
- Partials      594      596       +2     

Flag	Coverage Δ
unittests	48.91% <66.66%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
engine/action_transaction.go	36.27% <0.00%> (-0.36%)	⬇️
engine/model_draft_transactions.go	75.96% <68.62%> (+0.61%)	⬆️

... and 1 file with indirect coverage changes

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[Nazarii-4chain]

LGTM