@sentry/react-native 8.18.0-alpha.3 on Node.js NPM

Consume sentry-cocoa as a prebuilt xcframework by default on iOS (#6381)
Warning
This may be a breaking change for some setups. pod install now downloads Sentry.xcframework from sentry-cocoa's GitHub release (SHA256-verified) and vendors it, instead of building Sentry from source as a CocoaPod. If your iOS build breaks after upgrading (e.g. when another pod also depends on the Sentry CocoaPod), or if your pod install environment cannot reach github.com, set SENTRY_USE_XCFRAMEWORK=0 before pod install to restore the previous source-build behavior.