[Fizz] Switch the isPrimaryRender flag based on the stream config #21357
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It's possible for Fizz and Fiber to co-exist for example. If they both end up using the same context field then that can clash.
It's also possible for e.g. DOM and ART to co-exist on the server.
Or Legacy Fizz DOM and Modern Fizz DOM.
Instead of protecting against every possible clash, I just took the most common one. E.g. renderToString clashing with either Fiber or Modern Fizz.
I flip it in the legacy stream config so that renderToString use the secondary Context fields. #21276