Remove obsolete command registry

[bjoernricks]

What

Remove obsolete command registry

Why

With all commands converted to TypeScript and instantiated in the Gmp class directly the command registry is unused. Therefore it can be removed.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA 97e06bc.

Ensure that dependencies are being submitted on PR branches and consider enabling retry-on-snapshot-warnings. See the documentation for more information and troubleshooting advice.

Scanned Files

None

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.62%. Comparing base (7f98d70) to head (97e06bc).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5398   +/-   ##
=======================================
  Coverage   80.61%   80.62%           
=======================================
  Files        1269     1268    -1     
  Lines       33075    33063   -12     
  Branches     9921     9921           
=======================================
- Hits        26663    26656    -7     
+ Misses       5723     5718    -5     
  Partials      689      689           

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