fix: version should only log the version messages

[erickzanardo]

Description

shorebird --version was not properly setting the correct ExitCode and was being interpreted as failing, which would lead the CLI to print the open issue message.

This PR fixes that.

Fixes #2260

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore
• 🧪 Tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (0bacde2) to head (51ee959).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2262   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          186       186           
  Lines         5861      5862    +1     
=========================================
+ Hits          5861      5862    +1     

Flag	Coverage Δ
shorebird_cli	100.00% <100.00%> (ø)

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