Fix(JS): Screen Popped Listener

[mihnea-popescu]

Problem

ComponentEventsObserver.registerOnceForAllComponentEvents was passing notifyPreviewCompleted to registerScreenPoppedListener. This meant ScreenPopped events fired the wrong notification (and any screenPopped listeners on components never ran).

Fix

• register notifyScreenPopped as the listener for the native ScreenPopped event, instead of notifyPreviewCompleted
• add a regression test asserting ScreenPopped and PreviewCompleted are wired to their own distinct handlers

Verification

• yarn jest src/events/ComponentEventsObserver.test.tsx — 14/14 tests passed
• yarn eslint --ext .js,.jsx,.ts,.tsx src/events/ComponentEventsObserver.ts src/events/ComponentEventsObserver.test.tsx --quiet

Breaking changes

None.