fix(apple): don't compile bridge code in bridgeless mode

[tido64]

Description

Don't include bridge code in bridgeless mode.

See build failure: https://github.com/microsoft/react-native-test-app/actions/runs/26077758296/job/76672204311

Platforms affected

• Android
• iOS
• macOS
• visionOS
• Windows

Test plan

cd packages/app
node --run set-react-version -- nightly
yarn
cd example
pod install --directory=ios
yarn ios

Screenshots

[tido64]

This requires a change in @rnx-kit/react-native-host: microsoft/rnx-kit#4167