chore(SPV-1197): remove sqlmock-based test suites

[chris-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

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

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.38%. Comparing base (5623226) to head (0eb9de8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #771      +/-   ##
==========================================
- Coverage   45.46%   45.38%   -0.09%     
==========================================
  Files         339      339              
  Lines       17416    17416              
==========================================
- Hits         7919     7905      -14     
- Misses       8906     8918      +12     
- Partials      591      593       +2     

Flag	Coverage Δ
unittests	45.38% <ø> (-0.09%)	⬇️

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see 3 files with indirect coverage changes

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