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Eric Rozell 0449630612 Resolve Paper leak on Android (#46896 )

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/46896

On Android Paper UIManager, when calling `ReactRootView.unmountReactApplication`, the ReactRootView tag is unset [here](https://github.com/facebook/react-native/blob/main/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactInstanceManager.java#L926), before the round trip unmount operation to JS makes it's way back to a `dropView` call on `NativeViewHierarchyManager`.

In practice, this means that legacy architecture apps that unmount surfaces via `ReactRootView.unmountReactApplication` leak references to Views, and the "finalization" step (`onDropViewInstance`) is not universally called.

This is an attempt to fix the issue by skipping the `clearReactRoot` step on Paper, instead waiting for the round trip `UIManager.removeRootView` call.

## Changelog

[Android][Fixed] Fix issue where `onDropViewInstance` cleanup was not being handled after `ReactRootView.unmountReactApplication`

Reviewed By: javache

Differential Revision: D64054042

fbshipit-source-id: b8b8c237796674ca23a332e57a1bf2e07ab5af13

2024-10-09 05:25:10 -07:00