refactor(shorebird_cli): move artifact download out of patch diff checker

[bryanoltman]

Description

This refactor updates the PatchDiffChecker to accept a File instead of a url, moving the responsibility of downloading release artifacts out of PatchDiffChecker and into the ArtifactManager.

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 (f9e3834) 100.00% compared to head (54cd193) 100.00%.

❗ Current head 54cd193 differs from pull request most recent head 9b77ca8. Consider uploading reports for the commit 9b77ca8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1545   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          154       154           
  Lines         4768      4760    -8     
=========================================
- Hits          4768      4760    -8     

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

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.