feat(shorebird_cli): list detected flavors in shorebird init

[bryanoltman]

Description

Adds a list of detected flavors when running shorebird init.

No flavors:

With flavors:

This should help partially mitigate #1379

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

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (a149410) 100.00% compared to head (735631e) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1386   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          156       156           
  Lines         4618      4623    +5     
=========================================
+ Hits          4618      4623    +5     

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

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...s/shorebird_cli/lib/src/commands/init_command.dart	100.00% <100.00%> (ø)

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