cmd: unified create validation

[pinebit]

Unified create cluster and create dkg commands validation:

• The minimum number of nodes (operators) is 3.
• The threshold cannot be greater than the number of nodes (operators).

category: refactor
ticket: none

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.69%. Comparing base (85bd4b1) to head (ededf7e).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3246      +/-   ##
==========================================
+ Coverage   57.63%   57.69%   +0.05%     
==========================================
  Files         211      211              
  Lines       30370    30382      +12     
==========================================
+ Hits        17503    17528      +25     
+ Misses      10982    10968      -14     
- Partials     1885     1886       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[pinebit]

Shall be closed in favor of https://github.com/ObolNetwork/charon/pull/3242/files