Fix memory leak when a graph node is invalid. #54011
Merged
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If a graph node is invalid but a kernel is created then we set the kernel back to
nullptr
but we forget to delete it. Hence, we get a memory leak.PiperOrigin-RevId: 408968108
Change-Id: I1d8a9d0d8988ed5e08be8b9f2004ce1b4cd11b7c