[TF:TRT] Modify a test to workaround a TensorRT memory leak issue.
[TF:TRT] Modify a test to workaround a TensorRT memory leak issue.

Change the fully connected layer of the test to an elementwise add layer, to
workaround a heap memory leak issue found in TensorRT8.

PiperOrigin-RevId: 388258550
Change-Id: I8d8b54b4a7aa28498ad4a3f564e533d1c414576c

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