[quant][fx] Refactor _convert_fx_do_not_use (#73777)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73777
att, this is to prepare for the migration of current convert to this function
Test Plan:
regression tests to make sure the refactor doesn't break anything
internal only, since tensorrt tests are moved to a separate repo
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D34636000
fbshipit-source-id: 9850904e3b834345abbeedc8bccaf107397db59d
(cherry picked from commit a8c87d4592237c247989e7419bb165c96b8e90db)
