Use browser navigation when RSC payload fails to fetch (#46674)
Fixes #43605
Fixes NEXT-325
Fixes NEXT-193
This ensures that when the `fetch()` for the RSC payload gets redirected
server-side to a URL that fails CORS (e.g. an external url). This
catches the error and returns the url that was fetches to be
hard-navigated. This also covers other cases like when the host can't be
reached.
Added a note to add a test for this later as it depends on having a
deployment without CORS.
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