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Adds a flag to disable legacy mode. Currently this flag is used to cause legacy mode apis like render and hydrate to throw. This change also removes render, hydrate, unmountComponentAtNode, and unstable_renderSubtreeIntoContainer from the experiemntal entrypoint. Right now for Meta builds this flag is off (legacy mode is still supported). In OSS builds this flag matches __NEXT_MAJOR__ which means it currently is on in experiemental. This means that after merging legacy mode is effectively removed from experimental builds. While this is a breaking change, experimental builds are not stable and users can pin to older versions or update their use of react-dom to no longer use legacy mode APIs.