Next.js built-in fetch polyfill should automatically retry on errors

Next.js built-in fetch polyfill should automatically retry on retriable errors, like ECONNRESET.

We should start with the server-side polyfill and potentially do the client-side as well.

[timneutkens]

You can have a look at https://github.com/vercel/fetch-retry and https://github.com/vercel/fetch

[github-actions[bot]]

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