Auto merge of #21933 - notriddle:navigation-redirect-status-code, r=nox

Thread the status through navigation redirects

This is necessary because status codes affect whether the redirect is done with the same HTTP method or a different one.

This is part of #21886, but there's also a flaw in how iframes are handled that is causing the redirect to take over the entire window, so this commit doesn't entirely fix slither.io.

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