refactor(shorebird_cli): ShorebirdFlutterValidator use ShorebirdFlutter

[felangel]

Description

• refactor(shorebird_cli): ShorebirdFlutterValidator use ShorebirdFlutter
  • instead of using process directly

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

Patch coverage: 100.00% and no project coverage change.

Comparison is base (6ac8492) 100.00% compared to head (f09a8a6) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1076   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           87        87           
  Lines         3263      3253   -10     
=========================================
- Hits          3263      3253   -10     

Files Changed	Coverage Δ
...kages/shorebird_cli/lib/src/shorebird_flutter.dart	100.00% <100.00%> (ø)
...ib/src/validators/shorebird_flutter_validator.dart	100.00% <100.00%> (ø)

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