chore: app harness for testing RN/Expo apps with configured dependency versions

[russellwheatley]

Description

Related issues

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

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Project	Deployment	Actions	Updated (UTC)
react-native-firebase	Error		Apr 24, 2026 3:24pm

[gemini-code-assist]

Code Review

This pull request introduces two new harness applications—one for bare React Native CLI and one for Expo development builds—to facilitate local validation of React Native Firebase packages. The changes include project scaffolding, configuration files, and utility scripts for syncing dependencies and building the apps. Feedback highlights critical issues with non-existent dependency versions and incorrect relative paths to node_modules that would fail in a hoisted workspace environment. Additionally, suggestions were made to improve script portability by replacing ripgrep with grep, to refine cleanup logic to prevent accidental data loss, and to ensure Metro resolves modules from the repository root.