feat(shorebird_cli): support using linker from local engine

[felangel]

Description

• feat(shorebird_cli): support using linker from local engine

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 and coverable lines are covered by tests ✅

Comparison is base (bce214e) 100.00% compared to head (e237e8a) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1550   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          154       154           
  Lines         4766      4783   +17     
=========================================
+ Hits          4766      4783   +17     

Flag	Coverage Δ
shorebird_cli	100.00% <100.00%> (ø)

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[eseidel]

We might end up with this as engineConfig.path(....) to avoid and save some chars. 🤷