ci: add tvOS build smoke test

[janicduplessis]

Summary

• add a tvOS CI job that validates installation from a packed library tarball
• use a Stripe-style temp Expo integration project instead of mutating the example app
• prebuild and compile that project for Apple TV simulator

What changed

• add scripts/test-expo-tv-project.sh to create a throwaway Expo app for SDK 55
• pack the current checkout with npm pack
• install react-native-tvos and @react-native-tvos/config-tv in the temp app
• install the packed react-native-ease tarball
• update Expo config to exclude react-native from version validation and enable the TV config plugin
• run EXPO_TV=1 expo prebuild --clean --platform ios
• build the generated app for Apple TV simulator with xcodebuild

Why

• keeps the existing example app focused on its current platforms
• validates the real consumer integration path
• avoids flaky template alias resolution and example-app-specific TV config churn

Testing

• workflow changes only