chore(code_push_protocol): remove PatchArtifact model from protocol

[felangel]

Description

• chore(code_push_protocol): remove PatchArtifact model from protocol
  • since it's not part of the public protocol

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 (e584432) 100.00% compared to head (09bd8b5) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1361   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          152       150    -2     
  Lines         4434      4407   -27     
=========================================
- Hits          4434      4407   -27     

Flag	Coverage Δ
shorebird_code_push_client	100.00% <ø> (ø)
shorebird_code_push_protocol	100.00% <ø> (ø)

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