stream-clone: check the version of streaming clone supported by the client Make the server refuse to produce streaming clone bundle, if the client doesn't specify the stream=v2 capability. This is in preparation to introduce stream=v3. As far as I can tell, this capability was added at the same time as support for bundle2-based streaming pulls was added, so I don't expect clients to break. (the modern client doesn't break, at any rate)

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