[react-native] Pull up enableFastAddPropertiesInDiffing check · Issue #33043 · facebook/react

## Summary We don't need the isArray check for this experiment, as `fastAddProperties` already does the same. Also renaming slowAddProperties to make it clearer we can fully remove this codepath once fastAddProperties is fully rolled out. ## How did you test this change? ``` yarn test packages/react-native-renderer -r=xplat --variant=true ```

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This issue appears to be discussing a feature request or bug report related to the repository. Based on the content, it seems to be resolved. The issue was opened by javache and has received 2 comments.

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[react-native] Pull up enableFastAddPropertiesInDiffing check#33043