chore(shorebird_cli): add xcarchive upload instructions to release ios-alpha

[bryanoltman]

Description

Adds a third option to the release instructions (uploading the .xcarchive via xcode) to the shorebird release ios-alpha success output.

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 (d193729) 98.97% compared to head (20f9a9d) 98.97%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1277   +/-   ##
=======================================
  Coverage   98.97%   98.97%           
=======================================
  Files         180      180           
  Lines        4767     4769    +2     
=======================================
+ Hits         4718     4720    +2     
  Misses         49       49           

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.

Files Changed	Coverage Δ
.../lib/src/commands/release/release_ios_command.dart	100.00% <100.00%> (ø)

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