[quant][refactor] Change the structure of the ao migration tests (#64912)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64912
The test naming was confusing and ambiguous. The file was changed to reflect the framework that is being migrated ("quantization" instead of "quantize"). Also, the common testing class was extracted out
ghstack-source-id: 138157450
Test Plan: `buck test mode/dev //caffe2/test:quantization -- TestAOMigrationQuantization`
Reviewed By: vkuzo
Differential Revision: D30898214
fbshipit-source-id: 017f95995271d35bcdf6ff6a1b3974b837543e84
