[Torch Fx] Add test for quantized model graph (#2860)

### Changes

Added a test in tests/torch/fx/test_models.py to include a test for
quantized graph which compares the quantized graph with a reference
quantized graph.

### Reason for changes

To check if the graph was quantized correctly

### Ticket
#2766 

### Tests

test_quantized_model() was added in tests/torch/fx/test_models.py

tests/torch/data/reference_graphs/fx/reference_metatypes/unet.json

@@ -0,0 +1 @@
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