chore(shorebird_code_push_protocol): make CreateReleaseArtifactRequest canSideload optional

[bryanoltman]

Description

This is for backwards compatibility with older shorebird_cli versions

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

Patch coverage: 100.00% and no project coverage change.

Comparison is base (4c4f234) 98.97% compared to head (b52ed29) 98.97%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1287   +/-   ##
=======================================
  Coverage   98.97%   98.97%           
=======================================
  Files         180      180           
  Lines        4775     4776    +1     
=======================================
+ Hits         4726     4727    +1     
  Misses         49       49           

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

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

Files Changed	Coverage Δ
...ease_artifact/create_release_artifact_request.dart	100.00% <100.00%> (ø)

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