[quant][fix] Support quantization of ops where input is quantizable #49027
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Stack from ghstack:
Summary:
For cat followed by linear since the output of cat is not quanitzed, we didnt quantize the linear
This checks the uses of the cat op to insert observers
Test Plan:
python test/test_quantization.py TestQuantizeJitOps.test_cat_linear
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Differential Revision: D25403412