feat: add openUniversalLink method to Linking API (iOS only)

[Summys]

Feature Description: openUniversalLink

Why This Feature Is Needed

Apple's App Store Review Guideline 4.0 requires that apps provide a native in-app experience and avoid redirecting users to external web browsers, as this provides a poor user experience. Universal links are Apple's recommended solution for deep linking, allowing HTTP/HTTPS URLs to open directly within the corresponding native app when installed, rather than defaulting to Safari. The existing Linking.openURL() method allows fallback to Safari when no app can handle a URL, which can lead to App Store rejections. The new openUniversalLink() method uses UIApplicationOpenURLOptionUniversalLinksOnly to ensure URLs are only opened as universal links within installed apps, preventing unwanted browser redirects and helping developers comply with Guideline 4.0. This is essential for apps that handle authentication, registration, or any web content that should remain within the app experience.

This adds a new method to the Linking API that allows opening URLs as universal links on iOS using UIApplicationOpenURLOptionUniversalLinksOnly.

Changes:

• Add openUniversalLink method to Linking.js with iOS-only implementation
• Add RNTester example demonstrating the feature

The method returns a Promise indicating whether the URL was successfully opened as a universal link.

Related: https://reactnative.dev/docs/linking#openuniversallink

Summary:

Changelog:

Test Plan:

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