[quant][graphmode][refactor] Factor out getInputTensorQParamOpFusionInfo (#38358)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/38358
Test Plan: Imported from OSS
Differential Revision: D21559806
fbshipit-source-id: b243b811c5c5917f50a11ef5b26174baf46e683f
