feat: add shared E2E test library for cross-version testing (#1204)

* feat: add shared E2E test library for cross-version testing

- Create shared-e2e library with reusable test suite
- Rename E2E -> E2E-compat (RN 0.72.9 + React 18.2.0)
- Update E2E-compat to use shared test library
- Add metro.config.js for shared workspace support
- Add shared-e2e to root workspace

Benefits:
- Write tests once, run on all RN versions
- Eliminates code duplication between example apps
- Consistent testing across versions
- Easy maintenance in one location

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* chore: update yarn.lock

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* style: apply formatting to shared E2E files

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: abueide