refactor(very_good_flutter_plugin): remove logs during pre_gen

[alestiago]

Description

Removes some logs during pre_gen, they tend to spoil the output when generated through Very Good CLI.

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)
• [X] 🧹 Code refactor
• [ ] ✅ Build configuration change
• [ ] 📝 Documentation
• [ ] 🗑️ Chore