test(SPV-1086): mock external dependencies in endpoint tests

[dorzepowski]

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]

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Codecov Report

Attention: Patch coverage is 12.90323% with 27 lines in your changes missing coverage. Please review.

Project coverage is 45.82%. Comparing base (5d40daf) to head (8d79218).

Files with missing lines	Patch %	Lines
...ons/testabilities/fixture_spvwallet_application.go	0.00%	16 Missing ⚠️
config/config_to_options.go	0.00%	8 Missing ⚠️
engine/chain/chain_service.go	0.00%	1 Missing and 1 partial ⚠️
engine/client_options.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #732      +/-   ##
==========================================
- Coverage   45.93%   45.82%   -0.12%     
==========================================
  Files         322      322              
  Lines       13259    13276      +17     
==========================================
- Hits         6091     6084       -7     
- Misses       6605     6628      +23     
- Partials      563      564       +1     

Flag	Coverage Δ
unittests	45.82% <12.90%> (-0.12%)	⬇️

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

Files with missing lines	Coverage Δ
engine/client.go	55.00% <ø> (-0.74%)	⬇️
engine/client_internal.go	65.35% <100.00%> (+0.22%)	⬆️
engine/client_options.go	68.81% <50.00%> (-1.65%)	⬇️
engine/chain/chain_service.go	60.00% <0.00%> (-40.00%)	⬇️
config/config_to_options.go	0.00% <0.00%> (ø)
...ons/testabilities/fixture_spvwallet_application.go	0.00% <0.00%> (ø)

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