chore(shorebird_cli): hide split-per-abi flag, print warning

[bryanoltman]

Description

This change hides the split-per-abi flag from the release android command and prints a warning explaining why we do not currently support this flag.

Addresses but does not fix #1141

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 project coverage change: -0.03% ⚠️

Comparison is base (ba1c06d) 98.93% compared to head (3c77c93) 98.91%.

❗ Current head 3c77c93 differs from pull request most recent head 99a2093. Consider uploading reports for the commit 99a2093 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1255      +/-   ##
==========================================
- Coverage   98.93%   98.91%   -0.03%     
==========================================
  Files         179      179              
  Lines        4590     4596       +6     
==========================================
+ Hits         4541     4546       +5     
- Misses         49       50       +1     

Flag	Coverage Δ
shorebird_cli	99.96% <100.00%> (-0.04%)	⬇️

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

... and 1 file with indirect coverage changes

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