[quant][fx] Cleanup quantization_patterns.py (#74407)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/74407
The convert method of QuantizeHandler is no longer used after the convert refactor, this PR removes them
Test Plan:
python test/test_quantization.py TestQuantizeFx
python test/test_quantization.py TestQuantizeFxOps
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D34983830
fbshipit-source-id: cf9a6a19bd0ae035ba33497eecf74e98658dd5c7
(cherry picked from commit d85eb0f77513ef5f5f10543df6dec8b65b4985a3)
