refactor: make all mock class to private

[droidbg]

Description

I've updated all the mock classes presented in the code, changing them from public to private mocks.

Private Mocks are useful for a few reasons:

1. They make it clear that they should only be used in that specific test file.
2. They help keep the test file tidy and self-contained, so it doesn't rely on stuff from other test files.
3. They prevent accidental use in the wrong places.

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

Related Tickets & Documents

• Closes refactor: all Mocks should be private #827

[renancaraujo]

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