fix(SPV-1357): webhook tests

[chris-4chain]

Checked 4 times on GithubActions, and it works (one failed but because of other reason)
https://github.com/bitcoin-sv/spv-wallet/actions/runs/12685363196

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 @dzolt-4chain resulted in success.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 46.27%. Comparing base (d8a633c) to head (8ad7d45).

Files with missing lines	Patch %	Lines
engine/notifications/webhook_manager.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #843      +/-   ##
==========================================
+ Coverage   46.16%   46.27%   +0.10%     
==========================================
  Files         373      373              
  Lines       17928    17933       +5     
==========================================
+ Hits         8277     8298      +21     
+ Misses       9027     9013      -14     
+ Partials      624      622       -2     

Flag	Coverage Δ
unittests	46.27% <85.71%> (+0.10%)	⬆️

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

Files with missing lines	Coverage Δ
engine/notifications/webhook_manager.go	52.89% <85.71%> (+1.77%)	⬆️

... and 2 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d8a633c...8ad7d45. Read the comment docs.

[dorzepowski]

NICE