fix: re add dart lints

[giboin]

Description

The dart lints were gone 😢

- avoid_implementing_value_types:
        excludes:
          - '**m/*mocks.dart'

was breaking the yaml file, and the linter section was not listened anymore

Instead, let's ignore the lint in mock files of each project

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

[MaximeRougieux]

Can you add the Changelog also (as you have bumped the version in this PR)?