Fix some resource leaks in GpuCast and RapidsShuffleServerSuite #3231
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Noticed some warnings about leaked resources in the detailed test log, and upon investigating I found a few leaks. In the case of GpuCast, a column vector was being leaked if we threw an exception due to ANSI mode checks. For RapidsShuffleServerSuite, the
getBufferSendState
method returns an instance that must be closed but the tests were failing to do so.