Always return VolumeDataChannelDescriptor by value
Return VolumeDataChannelDescriptor by value from VolumeDataPageAccessor::GetChannelDescriptor to be consistent with other places that return VolumeDataChannelDescriptor.
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Return VolumeDataChannelDescriptor by value from VolumeDataPageAccessor::GetChannelDescriptor to be consistent with other places that return VolumeDataChannelDescriptor.