ci: Enhance React Native E2E test plan for comprehensive coverage

Refactors and expands the React Native E2E test suite (v1.0.0 to v1.1.0) with more granular validation for critical SDK functionalities.

Key enhancements include:
*   Detailed checks for cold launch, background/foreground deep links, custom events with rich parameters, and identity API round-trips.
*   A comprehensive test for the `stop()` API, verifying event suppression and resumption.
*   Updates the example app (`App.tsx`) and adds `getCustomerUserId` to native/JS interfaces to enable these new test scenarios.

This significantly improves pre-publish validation and overall plugin reliability.

Author: al-af