chore(BUX-223): remove unused authentication methods

[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.

Description

• Move authentication to spv-wallet

[github-actions]

Manual Tests

ℹ️ Remember to ask team members to perform manual tests and to assign tested label after testing.

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (375adbd) 59.98% compared to head (4296ba1) 59.42%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #585      +/-   ##
==========================================
- Coverage   59.98%   59.42%   -0.57%     
==========================================
  Files         101      100       -1     
  Lines        7323     7137     -186     
==========================================
- Hits         4393     4241     -152     
+ Misses       2493     2480      -13     
+ Partials      437      416      -21     

Flag	Coverage Δ
unittests	59.42% <0.00%> (-0.57%)	⬇️

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

Files	Coverage Δ
authentication.go	0.00% <0.00%> (-80.75%)	⬇️

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[dorzepowski]

Sorry for inconvenience.
Those changes need to be moved into spv-wallet after renaming.