feat(SPV-1341): change delete paymail endpoint to be more restful

[dzolt-4chain]

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 @jakubmkowalski resulted in success.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 10.52632% with 17 lines in your changes missing coverage. Please review.

Project coverage is 46.58%. Comparing base (bd6d183) to head (132c927).

Files with missing lines	Patch %	Lines
engine/action_paymails.go	0.00%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #854      +/-   ##
==========================================
- Coverage   46.60%   46.58%   -0.02%     
==========================================
  Files         390      390              
  Lines       18514    18524      +10     
==========================================
+ Hits         8629     8630       +1     
- Misses       9193     9204      +11     
+ Partials      692      690       -2     

Flag	Coverage Δ
unittests	46.58% <10.52%> (-0.02%)	⬇️

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

Files with missing lines	Coverage Δ
actions/admin/paymail_addresses.go	61.00% <100.00%> (+4.92%)	⬆️
docs/docs.go	100.00% <ø> (ø)
engine/action_paymails.go	41.87% <0.00%> (-4.98%)	⬇️

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