refactor: uikit sample universal links in push open app, not browser

[levibostian]

If you click a push notification with a Universal Link deep attached in the UIKIt app today, the browser will open instead of the app.

The sample app was missing a function from the documentation. With this added AppDelegate function, the app opens Universal Links instead of the browser.

QA

Currently, the sample app builds made in this PR are not able to be tested. The testing thus far has been my own QA testing on my computer.

[github-actions]

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[github-actions]

Sample app builds 📱

Below you will find the list of the latest versions of the sample apps. It's recommended to always download the latest builds of the sample apps to accurately test the pull request.

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• CocoaPods-FCM: levi/apn-uikit-fix-push-universal-links (1684775648)
• APN-UIKit: levi/apn-uikit-fix-push-universal-links (1684775634)