chore: remove migration-verification tool

[fdefelici]

Description

This patch remove migration-verification tool that was used during the transition from Stacks 1.0 to Stacks 2.0.

Applicable issues

• fixes chore: remove migration-verification tool #6264

Additional info (benefits, drawbacks, caveats)

Checklist

• Test coverage for new or modified code paths
• Changelog is updated
• Required documentation changes (e.g., docs/rpc/openapi.yaml and rpc-endpoints.md for v2 endpoints, event-dispatcher.md for new events)
• New clarity functions have corresponding PR in clarity-benchmarking repo
• New integration test(s) added to bitcoin-tests.yml

[obycode]

Nice!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.48%. Comparing base (799953e) to head (168b62e).
⚠️ Report is 19 commits behind head on develop.

❌ Your project status has failed because the head coverage (76.48%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6342      +/-   ##
===========================================
- Coverage    81.00%   76.48%   -4.52%     
===========================================
  Files          541      541              
  Lines       347855   347855              
===========================================
- Hits        281772   266062   -15710     
- Misses       66083    81793   +15710     

see 226 files with indirect coverage changes

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[github-actions]

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