Settle RNTester before sending visual deep link (#59518)

Summary:
Pull Request resolved: #59518

Visual capture deep-links each example immediately after relaunching RNTester. On a slow emulator the JS Linking listener is not registered yet, so the link is dropped and every example assertion fails. Settle the UI, link, settle again, then link again: the second send lands after subscription and re-sending is a no-op. Settle waits never fail, tolerating restore to another screen.

Changelog: [Internal]

Differential Revision: D127624232

fbshipit-source-id: ddd873bdecdc4a6ead10cd38e2e7d45529cce2df

Author: christophpurrer

packages/rn-tester/visual-tests/helpers/open-example.yml

@@ -2,6 +2,11 @@ appId: ${APP_ID} # iOS: com.meta.RNTester.localDevelopment | Android: com.facebo
 ---
 - launchApp:
     stopApp: true
+- waitForAnimationToEnd:
+    timeout: 30000
+- openLink: ${EXAMPLE_URL}
+- waitForAnimationToEnd:
+    timeout: 15000
 - openLink: ${EXAMPLE_URL}
 - runFlow:
     when: