javache 63af232d46 [react-native] Pull up enableFastAddPropertiesInDiffing check (#33043)
## 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
```

DiffTrain build for [0038c501a3](https://github.com/facebook/react/commit/0038c501a307e5ddc0cb80027e55740ddda09520)
2025-04-29 03:16:29 -07:00
2023-02-20 16:27:42 +00:00
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