Add rnrepo config to expo-example

[m-bert]

Description

After merging #4141 our expo-example stopped working, throwing errors in Gesture Handler module on Android.

From Claude:

1. RNRepo was supplying a stale prebuilt binary for expo-example

apps/expo-example/android/app/build.gradle applies the RNRepo plugin unconditionally (unlike basic-example which gates it on CI=1). Because there was no rnrepo.config.json in apps/expo-example/, the denyList at the repo root wasn't found. RNRepo injected the prebuilt react-native-gesture-handler@2.29.0 binary, which predates the setReanimatedAvailable TurboModule binding and doesn't have it registered.

Test plan

Run expo-example

[Copilot]

Pull request overview

Adds an rnrepo.config.json specific to apps/expo-example so RNRepo can correctly apply the denylist when the Expo example is built, preventing RNRepo from injecting a stale prebuilt react-native-gesture-handler binary (notably on Android).

Changes:

• Add apps/expo-example/rnrepo.config.json with a denylist for react-native-gesture-handler on Android and iOS.

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