[quant][graphmode] Refactor dynamic quant tests (#40039)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/40039
Similar to static quant, break it up into op level tests and tests for jit passes
Test Plan:
python test/test_quantization.py TestQuantizeScriptPTDQOps
python test/test_quantization.py TestDynamicQuantizeScriptJitPasses
Imported from OSS
Differential Revision: D22071278
fbshipit-source-id: 54292addcfbc00f7af960fb333921db2ff9fda04
