fix(shorebird_cli): fix release android target_platform with local_engine

[bryanoltman]

Description

Because the default value for shorebird release android's target-platform option is android-arm,android-arm64,android-x64 and because a local engine build targets only one of these, this PR updates the command to only use the target-platform args included in AndroidArch.availableAndroidArchs. An alternative solution would be to require --target-platform to be specified for local engine builds.

Type of Change

• [ ] ✨ New feature (non-breaking change which adds functionality)
• [x] 🛠️ 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (ccfeb87) to head (da3508a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1943 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 174 174 Lines 5493 5494 +1 ========================================= + Hits 5493 5494 +1 ``` | [Flag](https://app.codecov.io/gh/shorebirdtech/shorebird/pull/1943/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=shorebirdtech) | Coverage Δ | | |---|---|---| | [shorebird_cli](https://app.codecov.io/gh/shorebirdtech/shorebird/pull/1943/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=shorebirdtech) | `100.00% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=shorebirdtech#carryforward-flags-in-the-pull-request-comment) to find out more.

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[bryanoltman]

Closing this in favor of requiring a target platform being specified for local engine builds (e.g., shorebird release android --local-engine-src-path=$HOME/shorebirdtech/engine/src --local-engine=android_release_arm64 --local-engine-host=host_release --target-platform=android-arm64)