jackpope 32643b0eb3 Add useModernStrictMode as dynamic flag on www (#28346)
## Summary

Preparing modern strict mode rollout with dynamic feature flag

## How did you test this change?

![Screenshot 2024-02-15 at 10 09
49 AM](https://github.com/facebook/react/assets/8965173/9e90efc2-3578-4e63-ae2c-63d4a4e194b3)

DiffTrain build for commit https://github.com/facebook/react/commit/ef72271c2d1234c9d1e1358f8083021089a50faa.
2024-02-16 20:22:44 +00:00
2023-02-20 16:27:42 +00:00
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Description
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