Fix -v|--version CLI tool argument

[christianhelle]

This pull request includes changes to the src/Refitter/GenerateCommand.cs file to handle version flag arguments. The most important changes are:

• Added a check in the Validate method to return success if the version flag (--version or -v) is present in the command context arguments.
• Added a check in the ExecuteAsync method to return a status code of 0 if the version flag (--version or -v) is present in the command context arguments.

This resolves #560

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

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

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.92%. Comparing base (326a9e9) to head (9235bd8).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #561      +/-   ##
==========================================
+ Coverage   94.84%   98.92%   +4.08%     
==========================================
  Files          52       52              
  Lines        2578     2513      -65     
==========================================
+ Hits         2445     2486      +41     
+ Misses         98        4      -94     
+ Partials       35       23      -12     

Flag	Coverage Δ
unittests	98.92% <ø> (+4.08%)	⬆️

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