Next.js dev server should warn if React is not at least 16.10

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Next.js requires React 16.10 or newer for Fast Refresh to work correctly.

On older versions, Next.js will fallback to a full page reload every time.

We should emit a strong warning in this case and tell the user their dev experience will be suboptimal.

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Duplicate of #14900

[balazsorban44]

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