reuse ExportGenesisHead from cumulus_client_cli

[RomarQ]

What does it do?

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch rq/refactor-ExportGenesisHead

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[github-actions]

Coverage Report

@@                        Coverage Diff                        @@
##           master   rq/refactor-ExportGenesisHead      +/-   ##
=================================================================
+ Coverage   76.68%                          76.70%   +0.02%     
  Files         389                             389              
- Lines       76615                           76588      -27     
=================================================================
  Hits        58745                           58745              
- Misses      17870                           17843      -27     

Files Changed	Coverage
/node/cli/src/command.rs	17.65% (+0.69%)	🔼

Coverage generated Tue Dec 23 17:44:19 UTC 2025