http3: don't automatically set RoundTripper.QuicConfig.EnableDatagrams #4340
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If the user provides a quic.Config, we shouldn't modify it. Instead, we should return an error if the user enables HTTP Datagrams but fails to enable datagrams on the QUIC layer.
This isn't required by RFC 9297. If the QUIC layer disables datagrams, one could - in principe - use the Capsule protocol. However, that's probably never (?) intended by the user.