[quant][embedding qat] Add eager QAT test for EmbeddingBag+Linear model (#66334)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/66334
Test Plan: Imported from OSS
Reviewed By: HDCharles
Differential Revision: D31618283
Pulled By: b-koopman
fbshipit-source-id: bb824a341f1aa9d7e83f8e66d320a9dfd348a1d7
